Instagram Ads vs Facebook Ads: Where Your Budget Should Go

Instagram and Facebook are owned by Meta and run on the same ad platform. But the audiences, formats, and performance dynamics are different enough that thinking of them as one channel costs money.

Here's how to allocate intelligently between the two.

They're not identical

Despite running on the same platform:

• Audience demographics differ. Instagram skews younger (18-44 dominant). Facebook spans broader (25-65+).
• Content tolerance differs. Instagram favors visual, polished, and short-form video. Facebook tolerates more text, longer videos, link-heavy content.
• Format performance differs. Reels dominate Instagram; Feed and groups dominate Facebook.
• CPMs differ. Instagram CPMs are usually 20-50% higher than Facebook CPMs.
• Conversion behavior differs. Facebook users click links more readily; Instagram users prefer in-platform engagement.

Instagram strengths

Instagram outperforms when:

• Your category is visually-driven. Beauty, fashion, fitness, food, home goods.
• Your audience is 18-44. Especially women.
• Your creative is high-quality visual. Strong photography, video, design.
• You're building brand identity. Aspiration and aesthetic matter.
• You're targeting younger millennials and Gen Z.

Categories that crush on Instagram:

• Apparel and accessories.
• Beauty and personal care.
• Wellness and fitness.
• Home decor.
• Travel.
• Premium consumer products.

Facebook strengths

Facebook outperforms when:

• Your audience is 35+.
• Your offer requires explanation. Long-form copy and video work better here.
• Your category is information-dense. B2B, finance, education, real estate.
• You're driving link clicks to landing pages and content.
• You're using lead-gen forms. Facebook lead forms have higher fill rates than Instagram's.

Categories that work well on Facebook:

• Insurance and financial services.
• Real estate.
• Local services.
• B2B SaaS.
• Education and online courses.
• Some health products (where allowed).

Placement strategy

In Ads Manager, you can run on:

• Facebook feed.
• Facebook Stories.
• Facebook Reels.
• Facebook in-stream video.
• Facebook Marketplace.
• Instagram feed.
• Instagram Stories.
• Instagram Reels.
• Instagram Explore.
• Audience Network (third-party apps and sites).

Default recommendation: Advantage+ Placements — let Meta decide.

When to override:

• If you have specific creative for a placement (e.g., 9:16 video for Reels and Stories), exclude placements where it won't display well.
• If your creative is text-heavy, exclude Stories where text doesn't render well.
• If Audience Network is producing low-quality conversions (often the case), exclude it.

Format-by-platform performance

Instagram Reels

The single highest-growth placement on Meta in 2025. CPMs are still relatively low because supply is high. Native vertical video (9:16) with strong hook performs best.

For most accounts: 30-50% of Instagram spend should flow to Reels.

Instagram Stories

Vertical, full-screen, immersive. Best for:

• Retargeting (users in Stories tend to be loyal followers).
• Branded content with native creators.
• Limited-time offers and urgency.

Instagram Feed

Square or vertical creative. Mix of organic and ads. Strong for product-focused content with clear visuals.

Facebook Reels

Lower volume than Instagram Reels but improving. Same creative often works on both.

Facebook Feed

The bread-and-butter Facebook placement. Long-form copy, link clicks, traditional ad formats all work.

The cross-platform creative question

You have two options:

Option 1: One creative for all placements

Meta auto-crops your video for different placements. Easier to manage; performance is decent.

Option 2: Placement-specific creative

Different versions for different placements:

• 9:16 for Reels and Stories.
• 1:1 for feed.
• 4:5 for feed (taller, takes more screen real estate).

Placement-specific creative typically lifts performance by 15-30%. Worth the production investment for high-spend accounts.

Audience overlap

Most users are on both Instagram and Facebook. So:

• The same Custom Audience targets the same person across both.
• Lookalikes find similar users on both platforms.
• Frequency caps should be set at the user level, not the placement level.

Don't run separate "Instagram campaign" and "Facebook campaign" with the same audience. Run one campaign with both placements; let the algorithm allocate.

When to split campaigns by placement

Split when:

• Your creative is dramatically different (different videos for IG Reels vs FB Feed).
• Your offer is platform-specific (a giveaway requiring an Instagram follow).
• You're testing whether one platform outperforms the other for a specific audience.

Otherwise, single campaign with multiple placements.

CPM differences

Why Instagram CPMs are higher:

• Younger users with more disposable income.
• More ad inventory competition (especially in beauty and fashion).
• Reels growth has shifted user attention but not yet ad supply.

Higher CPM doesn't mean worse ROAS. If Instagram converts at higher rates, the higher CPM is justified.

Measuring per-platform performance

In Ads Manager:

• Filter results by Placement.
• Compare CPM, CTR, CPA, ROAS by placement.
• Note which placements drive the most volume and which drive the best ROAS.

Common findings:

• Instagram Feed: highest CPM, highest CTR, highest ROAS for visual products.
• Facebook Feed: lower CPM, more clicks-to-link, more leads for B2B.
• Reels (both): lowest CPM, highest video views, best for new acquisition.
• Audience Network: lowest CPM, lowest CTR, often worst ROAS.

Audience Network: usually exclude

Audience Network places ads in third-party apps. CPM is lowest, but:

• Click quality is questionable (lots of accidental clicks).
• Conversion rate is low.
• Returns are often suspicious.

Most accounts should exclude Audience Network from purchase-objective campaigns. Test it for awareness or video views.

Common platform-allocation mistakes

• Treating Meta as one channel. Different audiences, different formats, different optimization.
• Running square-only creative. Misses the scale of vertical Reels and Stories.
• Pulling out of Instagram because of high CPM. Compare ROAS, not CPM.
• Ignoring Reels growth. Most spend should flow to short-form vertical video in 2025.
• Splitting campaigns unnecessarily. Most accounts should run unified campaigns with all placements.

Allocation guide

Rough budget split based on category:

| Category | Instagram % | Facebook % | |---|---|---| | Beauty / fashion | 65-80% | 20-35% | | Fitness / wellness | 60-75% | 25-40% | | Home / decor | 55-70% | 30-45% | | B2B SaaS | 25-40% | 60-75% | | Insurance / finance | 20-35% | 65-80% | | Education / courses | 35-50% | 50-65% | | Real estate | 30-45% | 55-70% | | General e-commerce | 50-65% | 35-50% |

These are starting points. Let actual ROAS data refine the split for your specific account.

A 14-day platform allocation test

If you've been running broad placements:

• Run your current campaigns with placement-level breakdown enabled.
• After 14 days, pull the data: CPA and ROAS by placement.
• Move budget toward the placements producing the lowest CPA in your category.
• Test placement-specific creative if you find a winner.

Most accounts find a 15-30% performance lift from intentional placement allocation. The platforms are similar enough to run together, different enough to optimize separately.