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Alternative Social Media Platforms
(lemm.ee)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
What do you use Facebook for?
In terms of replacements with somewhat close feature sets there's Friendica. It's ActivityPub based like Lemmy and Mastodon. But ultimately it's usually about people and groups you interact with and they probably won't be there.