Testing ActivityPub syndication

If Mastodon replaces Twitter as the rising microblogging platform, the “super-RSS” ActivityPub protocol it uses re-opens the window for blogging.

I know this instance is advertising to the fediverse and is discoverable on Mastodon, but I need to test whether new posts syndicate.

This is WordPress 6.1 using ActivityPub (v0.13.4) and WebFinger (v3.2.5).