Serious question: what feature is missing for most people in order to replace sites like FB, Twitter with a messenger like Telegram, Signal? It seems to me tha

Serious question: what feature is missing for most people in order to replace sites like FB, Twitter with a messenger like Telegram, Signal? It seems to me that messengers more accurately match the "social network" paradigm these days, while FB and Twitter are more like TV or newspapers (though curated by "friends"). Is it the discovery of new people to "stalk" and eventually engage with? Or engaging with content outside your actual social network (commenting media articles etc.)? A desktop/web version? The feeling that you're not actually disturbing anyone directly by posting something because there's a chance it will not pop up in their feed? Something else?