Hexadezimalion is a user on octodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
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Interesting: Sync your Mastodon back to Twitter - https://medium.com/@pimterry/sync-your-mastodon-back-to-twitter-3c72f2bc8626
@Hexadezimalion I added a hashtag to the IFTTT recipe that I'm using to do this so that every reply on Masto doesn't post on the bird site.