Instagram's algorithm prioritizes watch time, shares, and saves, resulting in superior user engagement that attracts younger users and causes a shift away from Facebook. Instagram's engagement rate of 0.48% remained nearly flat in 2025, while Facebook's averaged 0.15%, showing a decline.

Medium confidenceStructural

CURRENT STATE

Instagram reached three billion active users by Q3 2025, with monthly active users growing by almost 8% since 2024 to 2.3 billion in 2026. Facebook's user engagement is declining across all age groups, with 32% of 18-24 year olds and 35% of 25-34 year olds reporting a significant reduction in their usage.

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