Mutuals — often shortened to "moots" — are the people who follow you while you follow them back. It sounds simple, but the mutual follow carries more social weight than a one-way connection. It's an implicit signal: I see your content, and I think it's worth my attention.

Mutuals on these types of websites (mastodon/blusky/shitter) doesn't necessarily mean friend, just that you follow them and they follow you.

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in tumblr speak it means someone who they follow that also follows them