Source: Daring Fireball
Bluesky and Threads have repurposed iOS screenshot functionality—a system-level feature users assume is neutral—as a distribution channel by swapping UI elements like follow buttons with app install prompts. These apps intercept the screenshot moment before iOS captures the display, giving them a millisecond window to show users a different interface than what appears on screen. The tactic shows how aggressively social platforms are competing for growth as organic feed algorithms and traditional app store placement have become saturated, turning a core OS feature Apple didn't design for advertising into a growth lever.