part of the reason social apps get boring over time is that the original constraints that made them fun get removed as features are added.

just as a game with no rules is no fun.

twitter was more fun when the constraint was 140 chars. ig was more fun when it was just square photos, etc.

I beg to differ. Metrics that a social network choose to optimize shape users behavior much more than specific features. It is the way Twitter measure and incentivize engagement prompted the inundated cliche threads, not the thread feature itself.