First-order effects

• Advertisers who could only run simplified Instagram campaigns gain access to Facebook's complete targeting stack — the same custom audiences, behavioral segments, and measurement they already use on the main platform — immediately changing how budgets are allocated across the two properties.
• Instagram's ad product stops being a separate sales pitch: Facebook's ad team can now sell one campaign spanning both apps, tightening its grip on brand and direct-response spend that might otherwise have gone to other platforms.

Second-order effects

• With full targeting available, pressure builds on Instagram to expand ad inventory to absorb the demand — a dynamic that later coverage confirms when Facebook pushes Instagram to double its ad load and experiment with consecutive Stories placements.
• Rival platforms selling visual advertising face a competitor whose pitch is no longer reach alone but data-driven precision, forcing them to either build comparable targeting from thinner user graphs or compete on price and placement instead.

Third-order effects

• If the integration holds, Instagram effectively becomes a distribution channel of Facebook's ads business rather than an independent product — a structure that later draws scrutiny, as seen in Meta's eventual move to give outside researchers more visibility into political ad targeting across Facebook and Instagram.
• The consolidation points toward social advertising organizing around whoever controls the richest identity graph, making cross-app targeting depth the durable moat and ad-load management the main lever left for balancing revenue against user experience.