anarchism.space upgraded to Mastodon 2.9 earlier this month (sorry for the lack of public notice)
This release's main change is the single-column mode by default for the web UI. The multiple column UI is still available in your settings.
Full release note here: https://github.com/tootsuite/mastodon/releases/tag/v2.9.0
Also done earlier this month is the block of gab.com as well as gab.ai and develop.gab.com (far-right instance)
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!