mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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active users

Fediverse Report

There are quite a few tools that help you find interesting accounts to follow. I wrote about how the space has evolved, and these tools have build upon each other. Here's an overview of some of them:

fedifollows.fedified.com/ by @DataDrivenMD A curated list with the accounts separated by ~20 topics. Allows 1-click follow, and prioritizes accounts by activity. A good option for new users that want to get started.

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@spreadmastodon

fediversereport.com/a-next-gen

FediFollows | FedifiedExplore MastodonLists of the most active and engaging Mastodon accounts organized by topic of interest.