Ooops... this post was written months ago, but accidentally wasn't pushed publicly till now! So... a delayed celebration to all!
We're proud to announce that after a three year journey, ActivityPub is now a W3C Recommendation! Thank you and congratulations to the many, many people involved in this standardization effort. We couldn't have done it without you.
Now comes the fun part... building ActivityPub applications! Join us in the Social Web Community Group to discuss ActivityPub implementation and new frontiers!