I blame all the similar sounding terms and organizations in the fediverse space. It’s actually pretty cool

What SWF is:

In a gesture that’s been a long time coming, Evan Prodromou, co-author of the ActivityPub protocol, has launched The Social Web Foundation. The organization aims to tackle the various headaches and challenges the ActivityPub ecosystem has faced over the last decade of its development. Their mission? A bigger, better Fediverse.

From this article:

the SWF has been working on several interesting projects outside of these stated scopes, and it’s something Evan Prodromou has been bullish about: leveraging the ActivityPub Client-to-Server API. Historically, this piece of the ActivityPub protocol is rarely ever implemented, due to complexity as well as the fact that Mastodon’s own client API has seen widespread adoption.