Its also about action seeding, for later events. With each strike like this some people leave and its likely they are early(ish) adopters, and also likely that they are opinionated ones (just my theory). So their leaving reduces the quality of the network, for the bulk of passive users. And I know (anecdotally) few passive users. People who just read and never do any comments or likes. So the value of the network goes down for them. And they may then spend lesser time. Or may have lesser satisfaction. So network effects brought it to where it is, and they also work very well in the other direction.

On the other thread on HN today, on WhatsApp founder, I wonder if they wouldn't have sold to Facebook (of all the players), what would have been the social media landscape be like today?

I am just hoping, like I am sure many others on HN, that this event finally seeds an open social network, which works like emails do.