The other factor is that everyone now knows how powerful social media can be. Remember when we had positive movements like Occupy Wallstreet, the Arab Spring and Anonymous Hacktivism all facilitated by social media? That doesn't happen anymore. Small things like getting traction for a petition still work, but anything that questions existing structures has no chance of succeeding anymore. Instead social media is overrun by bots that simulate broad consensus on many issues
And that’s without putting things like dating apps, advertisements and privacy violations in the mix.