Mastodon is called a "decentralized Twitter", in which microblogs are scattered across many independent servers interconnected in one network.
There are a lot of updates in this version. Here are the most important ones:
- No longer supported OStatus, the alternative is Activity Pub.
- Removed some deprecated REST APIs:
- GET /api/v1/search API, GET /api/v2/search instead.
- GET /api/v1/statuses/:id/card now uses the card attribute.
- POST /api/v1/notifications/dismiss?id=:id, instead POST /api/v1/notifications/:id/dismiss.
- GET /api/v1/timelines/direct, GET /api/v1/conversations instead.
And a lot of other changes too.
Incidentally, lor.sh already updated to the latest version.
Source: linux.org.ru