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

Administered by:

Server stats:

373K
active users

There's a Fediverse alternative to #Reddit called #Kbin. More info at kbin.pub

Still VERY new, not many servers yet, two so far in English:

fedia.io
kbin.social

No app yet, use it through these sites. Subreddits are called "Magazines". You can interact with magazines from other servers.

Coders help Kbin at codeberg.org/Kbin/kbin-core, non-coders donate at buymeacoffee.com/kbin

(Sorry to people bored of this, had many requests to put info in one place)

kbin.pubHome | kbin.pub - Fediverse of content

@retrodev

No, it's a separate project but it's part of the Fediverse too.