I've been enjoying watching videos from "The Coding Train", which covers a lot of different programming topics, including Mastodon! (youtube.com/watch?v=sKSxBd56H7)
Strangely addictive because the presenter is so enthused.

A Mastodon instance for maths people. The kind of people who make $\pi z^2 \times a$ jokes.

Use $ and $ for inline LaTeX, and $ and $ for display mode.