Say something [on Twitter] about feminism or race, or sea lions and you’d find yourself inundated by the same trite responses from multitudes. Complain about it, and they turn nasty, abusing you, calling in their friends to join in. Your phone becomes useless under the weight of notifications; you can’t see your friends support amongst the flood.
Twitter has become the hate speech wing of the free speech party.
–Kevin Marks on the fall of Twitter.
Marks also lists some alternatives to Twitter, such as Known and Quirell, both of which create semi-private social media networks and neither of which can replace the reach and discoverability of Twitter at its “best”.
Marks doesn’t mention my personal favourite (and now sadly dead) un-Twitter service, which was App.net. App.net was infamous for a while as the Twitter for “people with $50” (you originally had to pay $50 for an account), and has struggled to find its feet ever since. Technically, the Twitter-ish aspect of it is only one part of its service, and that “What is App.net?” confusion is, I think, part of the reason it never really took off.