Of course, groups have their downsides. Facebook’s groups product has regularly come in for criticism for hosting extremism and misinformation, particularly related to vaccines. The same thing that can make groups fun to use — the posts are less visible to outsiders, and can therefore build a sense of shared purpose — also makes them harder to poli... See more

This is hardly a profound observation. It has been clear for many years that the Internet made it possible for new communities to form, sometimes with astonishing speed. The problem, as Zeynep Tufekci explained in [Twitter and Tear Gas](https://www.twitterandteargas.org/), is that the ease of network formation made these communities more fragi... See more