The next great social network is just the Web. ActivityPub is a W3C standard from 2018 that mostly was ignored until 2023 when Twitter users discovered Mastodon and Reddit users discovered Lemmy. ActivityPub is now implemented by giants like WordPress and Meta Threads. This live coding session will demonstrate how the ActivityPub protocol works, how it works with the Activity Streams and WebFinger standards, and how every website can become a social media profile that can be followed, liked, and commented upon.