I 'm surprised sociologists would take Zuck's words seriously. I ve watched him in interviews and in his own podcasts and he doesn't sound like having any kind of sophisticated worldview. The 'context collapse' more likely has to do with the fact that, from an algorithmic point of view, all news fit in the same data format, and nobody cared to introduce context. Or they introduced it in a wrong way (like Google+ did with circles). In the end, context reappeared in the form of separate social networks (linkedin, slack, twitter etc) so it s probably all good