Bridgy

Bridgy is an open source project and proxy that implements backfeed and POSSE as a service. Bridgy sends webmentions for comments, likes, etc. on Flickr, GitHub, Mastodon, Reddit, and Bluesky, formerly Facebook, Instagram, and Twitter. It can also POSSE posts, issues, comments/replies, retweets, RSVPs, and likes/favorites/stars to Flickr, GitHub, and Mastodon, formerly Facebook and Twitter. Finally, it adds webmention support to Blogger, Tumblr, WordPress.com, and Medium blogs. https://brid.gy/

Looking to connect your site with Fediverse/Mastodon etc. servers? See: BridgyFed. https://brid.gy/about#bridgy-fed