The original creator of mastodon has stated his preference for leaving this out of the core of mastodon: https://github.com/tootsuite/mastodon/issues/3888 https

The original creator of mastodon has stated his preference for leaving this out of the core of mastodon: https://github.com/tootsuite/mastodon/issues/3888 https://github.com/tootsuite/mastodon/issues/3888 ...But by the virtue of mastodon being only one open source platform that works on the overall federated universe and employs the OStatus protocol, there isn't anything stopping such a service as you described from being built...well, except for twitter eventually deciding to block access to their platform...but i'd guess that would turn the federated universe into a sort of social network martyr. Anyway, sorry i digress...To answer your question a bit more concretely, there are options for what you asked about: * https://github.com/halcy/MastodonToTwitter https://github.com/halcy/MastodonToTwitter * https://medium.com/@pimterry/sync-your-mastodon-back-to-twitter-3c72f2bc8626 https://medium.com/@pimterry/sync-your-mastodon-back-to-twit... I'm sure there are more options; try googling. Cheers!