Running Google & Facebook Ads Together: Cross-Platform Strategy

Why Run Google & Facebook Ads Together

Running Google and Facebook ads together isn't just about doubling your advertising presence—it's about creating a comprehensive marketing ecosystem that captures customers at every stage of their journey. While many advertisers treat these platforms as competitors, the smartest marketers know they're complementary tools that serve different purposes.

Google Ads excels at capturing demand. When someone searches "best CRM software for small business," they're actively looking for a solution. Google Search ads put you in front of these high-intent users at the exact moment they're ready to buy. The platform is pull-based marketing—people come to Google with problems, and your ads provide solutions. Facebook Ads excels at creating demand. Most Facebook users aren't actively shopping when they scroll their feed. Instead, Facebook's powerful targeting lets you reach people based on interests, behaviors, and demographics, introducing your product to audiences who didn't know they needed it yet. It's push-based marketing that builds awareness and desire.

Key Insight: The most successful advertisers use Google to harvest existing demand and Facebook to cultivate new demand, creating a complete funnel from awareness to conversion.

Here's why this integrated approach works so well:

• Complete funnel coverage: Facebook handles awareness and consideration while Google captures conversion-ready searchers
• Reinforcement effect: Users who see your Facebook ads are more likely to click your Google ads when they search later
• Broader reach: Google has 90%+ search market share; Facebook reaches 2.9 billion monthly users
• Diversified risk: Platform policy changes or performance fluctuations on one platform won't tank your entire advertising program
• Better attribution insights: Running both reveals how different touchpoints contribute to conversions

According to a 2024 study by WordStream, advertisers running coordinated Google and Facebook campaigns saw 38% higher overall ROAS compared to those running isolated campaigns on each platform.

Smart Budget Allocation Strategy

The eternal question: how much should you spend on each platform? The answer isn't one-size-fits-all, but there's a methodology that works for most businesses.

Initial Budget Split Framework

Start with these baseline allocations based on your business model:

These are starting points, not gospel. After 2-4 weeks of data collection, you'll adjust based on your specific results.

The Dynamic Reallocation Method

Here's the systematic approach I recommend to my clients:

Week 1-2: Equal testing phase

• Split budget 50/50 between platforms
• Run identical offers on both (adapted to each platform's format)
• Track CPA, ROAS, and conversion quality for each

Week 3-4: Initial optimization

• Identify which platform delivers lower CPA for cold traffic
• Shift 60% of budget to the better-performing platform
• Use the 40% platform for retargeting and specific objectives it handles better

Month 2+: Continuous optimization

• Review performance weekly
• Reallocate in 5-10% increments based on 7-day ROAS trends
• Maintain at least 30% on your secondary platform to keep learning and retargeting active

Pro Tip: Don't pull all budget from your underperforming platform. Facebook might generate awareness that leads to Google conversions, and vice versa. Maintain presence on both to capture the full customer journey.

Budget Allocation by Funnel Stage

Another effective approach allocates budget by funnel position rather than platform:

• Awareness (40% of budget): Facebook/Instagram feed ads, Google Display Network
• Consideration (30% of budget): Facebook retargeting, Google remarketing, YouTube
• Conversion (30% of budget): Google Search, Facebook dynamic retargeting

This ensures you're feeding the top of the funnel while capturing ready-to-buy customers at the bottom.

Coordinating Audiences Across Platforms

The magic of cross-platform advertising lies in strategic audience coordination. You're not just running ads on two platforms—you're orchestrating a conversation with customers across their entire digital experience.

The Audience Waterfall Strategy

Think of your audiences as flowing through a waterfall, with each platform catching different groups at different stages:

1. Facebook: Wide net at the top

• Broad interest targeting (1-3 million audience size)
• Lookalike audiences based on your best customers
• Demographic targeting with relevant interests
• Goal: Generate awareness and initial engagement

2. Google Display: Middle of the waterfall

• Remarket to Facebook engagers who haven't converted
• Target in-market audiences searching related terms
• Place on relevant content sites your audience reads
• Goal: Stay top-of-mind as prospects consider options

3. Google Search: Bottom conversion catch

• Branded search campaigns for people who remember you from Facebook
• Competitor campaigns for those comparing options
• High-intent keyword campaigns for ready-to-buy searchers
• Goal: Convert warmed-up prospects and capture new high-intent searchers

Audience Exclusion Coordination

Smart advertisers don't just target—they exclude. Here's how to avoid wasting money on the wrong audiences:

Cross-Platform Custom Audiences

The most powerful strategy is creating custom audiences that span both platforms:

Upload customer lists to both platforms for lookalike/similar audience creation

Sync your CRM: Use tools like Zapier or native integrations to create real-time audience segments

Website visitor audiences: Facebook Pixel and Google Ads tag should fire on the same pages

Video viewer audiences: Retarget YouTube viewers on Facebook and vice versa

Lead form responders: Anyone who fills a Facebook lead form should enter Google remarketing

For more on audience building strategies, check out our guide on advanced audience segmentation techniques.

Aligning Messaging and Creative

Running consistent messaging across platforms reinforces your brand and increases conversion rates. But "consistent" doesn't mean identical—each platform requires format optimization while maintaining thematic coherence.

The Message Framework

Start with a core message framework that adapts to each platform:

Core Brand Message: What makes you different in one sentence Facebook Adaptation: Expand into a story format

• Hook in first line to stop the scroll
• Visual-first creative (image or video)
• Emotional appeal and lifestyle context
• Soft CTA ("Learn more" rather than "Buy now")

Google Search Adaptation: Compress into solution-focused text

• Headline addresses the search query directly
• Highlight your unique differentiator
• Include price/offer if that's a competitive advantage
• Strong CTA ("Get started" or "Request demo")

Example for a CRM software company: Core Message: "CRM software that actually gets used by your sales team" Facebook Ad:

• Visual: Sales team smiling at laptop
• Copy: "Tired of CRM systems your team ignores? We built a CRM so simple, sales reps actually love using it. See why 12,000 teams switched to [Brand]."
• CTA: Learn More

Google Search Ad:

• Headline: "CRM Software Sales Teams Actually Use"
• Description: "Simple, powerful CRM with 98% user adoption rate. Free trial. No credit card required."
• CTA: Start Free Trial

Creative Asset Coordination

While messaging stays consistent, creative formats must match platform best practices:

Creative Tip: Create a master set of brand assets (product photos, team photos, logo variations) and adapt them to each platform's specifications rather than designing from scratch each time.

Seasonal and Promotional Coordination

When running promotions, synchronize timing across platforms but vary the approach:

Week 1: Announcement

• Facebook: Teaser campaign building anticipation
• Google: Update ad copy to mention "coming soon"

Week 2-3: Active Promotion

• Facebook: Full creative with offer details, countdown timers
• Google: Aggressive bidding on high-intent keywords, sitelink extensions with offer

Week 4: Last Chance

• Facebook: Urgency messaging to engaged audiences
• Google: Remarketing with "ends soon" messaging

Tracking and Attribution

You can't optimize what you can't measure. Cross-platform campaigns require robust tracking infrastructure to understand which touchpoints actually drive conversions.

Essential Tracking Setup

Before launching any cross-platform campaign, ensure you have:

Google Analytics 4 properly configured
- Both Facebook and Google ads sending data to GA4
- Conversion events properly defined
- Enhanced ecommerce tracking enabled

UTM parameters on all ads
- Consistent naming conventions across platforms
- Format: utm_source=facebook, utm_medium=paid_social, utm_campaign=spring_sale_2025
- Use a UTM builder tool to stay consistent

Platform pixels/tags correctly installed
- Facebook Pixel on all pages
- Google Ads conversion tracking tag
- Both should fire on thank-you/confirmation pages

Server-side tracking (recommended)
- Conversions API for Facebook
- Enhanced conversions for Google
- More accurate tracking as browser restrictions increase

Multi-Touch Attribution Models

The biggest challenge with cross-platform advertising is attribution. A customer might see your Facebook ad, search for you on Google a week later, and convert. Which platform gets credit?

Last-click attribution (default in most platforms): Google gets 100% credit. This undervalues Facebook's role. First-click attribution: Facebook gets 100% credit. This ignores Google's conversion assistance. Linear attribution: Both get 50% credit. Simple but doesn't account for touchpoint importance. Time-decay attribution: More recent touchpoints get more credit. More realistic but still imperfect. Data-driven attribution (Google's machine learning): Compares conversion paths to assign fractional credit. Most accurate but requires significant conversion volume.

For most businesses, I recommend starting with linear or time-decay attribution in Google Analytics 4, then graduating to data-driven attribution once you have 400+ conversions per month.

The Dashboard You Actually Need

Create a weekly cross-platform dashboard that shows:

Then track assisted conversions separately to see how often each platform assists the other's conversions. This reveals the true value of your awareness campaigns.

Ready to master cross-platform tracking? Sign up for AdsMAA and get AI-powered attribution insights across all your advertising platforms.

Common Mistakes to Avoid

After managing hundreds of cross-platform campaigns, I've seen the same mistakes repeated. Here's how to avoid them:

Mistake #1: Using Identical Budgets for Testing

The Problem: Giving Facebook and Google equal budgets sounds fair, but it ignores that platforms have different costs per click and conversion rates. The Solution: Set equal time periods for testing (2 weeks each) with whatever budget achieves statistical significance (usually 50-100 clicks minimum per platform). A platform with $2 CPCs needs half the budget of one with $4 CPCs to generate the same number of tests.

Mistake #2: Comparing Platform Metrics Directly

The Problem: Celebrating a $0.50 CPC on Facebook while lamenting a $3 CPC on Google ignores that these clicks have different quality and intent. The Solution: Compare CPA and ROAS, not CPC or CTR. A $3 click that converts 10% of the time (CPA = $30) beats a $0.50 click that converts 0.5% of the time (CPA = $100).

Mistake #3: Killing Platforms Too Quickly

The Problem: Pausing all Facebook ads after week one because Google's delivering better immediate ROAS. The Solution: Facebook often assists Google conversions. Run both for at least 4 weeks before making major budget cuts. Check assisted conversions in Google Analytics before deciding.

Mistake #4: Platform Siloing

The Problem: Different team members or agencies managing each platform without communication, leading to conflicting messages and audience overlap. The Solution: Weekly cross-platform meetings reviewing performance, messaging, and audience strategy. Use shared documents for campaign calendars and creative briefs.

Mistake #5: Ignoring Mobile Differences

The Problem: Most Facebook traffic is mobile; most Google Search traffic is desktop. Using the same landing page for both creates friction. The Solution: Create mobile-optimized landing pages for Facebook traffic or use different landing pages for each platform. Test load speed especially for mobile Facebook traffic.

Mistake #6: Over-Complicating Attribution

The Problem: Spending weeks implementing complex attribution models before even launching campaigns. The Solution: Start with platform-native attribution, layer in GA4 over month one, and only move to advanced attribution when you have sufficient conversion volume. Perfect attribution is the enemy of good advertising.

For businesses spending under $10,000/month combined, simple platform attribution plus GA4 multi-channel funnels is sufficient. Save advanced attribution for when you're scaling past $25K/month.

Running Google and Facebook ads together isn't twice the work—it's a multiplier on your results. By treating them as complementary platforms that serve different purposes in your customer journey, you'll build an advertising program that's more resilient, reaches more people, and ultimately drives better returns.

Start with the budget allocation frameworks above, coordinate your audiences to avoid overlap and waste, align your messaging while optimizing for each platform's format, and track everything properly from day one. Avoid the common mistakes, give your campaigns time to learn, and you'll build a cross-platform advertising machine that consistently delivers results.

Ready to launch your cross-platform advertising strategy? Sign up for AdsMAA and get AI-powered campaign management across Google Ads, Facebook Ads, and more—all in one platform.