In the first quarter, Org Social already surpassed twtxt in activity.

The difference is only 6 posts; it's practically a technical tie. But even so, it's a good sign.

I'll try to find time to write a post so others can reproduce the data. The methodology wasn't complicated: reading the feeds registered at relay.org-social.org/feeds/ and reading the HTML feed from twtxt.net. There may be more active feeds, but I'm not aware of them.