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1 year agothe user feed is just made up of posts from people you follow in chrono order.
You can also follow hashtags, block hashtags, and block words/phrases.
The Local Timeline shows posts from everyone on your instance. The Federated Timeline is a fire hose. It shows all posts in chronological order (as received by your instance).
There are several mental-health communities. A few I can think of are /bipolar and /ocd.