[jeroenhd]

If twitter.com goes down, all of twitter is gone. There is no secondary Twitter server or alternative service that you can use to do your day to day tweeting without completely depending on Twitter's centralised API.

If mastodon.social goes down, c.im accounts will still be live and I'll be able to follow them through a mastodon.nl account if I want to. It'll be sad to see the toots from mastodon.social disappear, but most of the Fediverse network will remain online. By segmenting users across different servers, the ecosystem can remain alive despite the collapse of a big server.