mastodon.world is one of the many independent Mastodon servers you can use to participate in the fediverse.
Generic Mastodon server for anyone to use.

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Meredith Whittaker

Apparently there's an imposter pretending to be me and messaging infosec and infosec-adjacent folks cold on Signal (or, at least these are the people reporting it).

So, for the record I will NEVER cold message people on Signal. If you don't know me, or we didn't connect explicitly via a contact or at an event, I will not reach out to you. Ever. I have, like, better things to do, for one...