Twitter is criticized for its ads, addictive features, lack of chronological feed, bans and spam. Mastodon and similar programs are criticized for their lack of clear incentives for server owners and the potential for despotism from a single person. SSB (Secure Scuttlebutt) is praised for its lack of problems but criticized for its complicated protocol and insistence on a chain of updates from a single user. Other solutions that require everyone to run their own server are criticized for requiring everyone to run their own server and the potential for censorship.