I’ve added a plugin, Mastodon Autopost, to crosspost from this blog to my Mastodon instance.
This won’t bring back any reactions to this blog, unlike Twitter reactions which do get back to this blog through Webmention. For that I would need to use Bridgy Fed. However that has as a disadvantage that it would turn my blog into a separate ActivityPub account, an activitypub user in its own right.

For now I’d rather have a separate Mastodon account (on my personal instance). Not everything I post on my blog I want to post to Mastodon, and not everything I post on Mastodon I want to have in my blog (e.g. responses to or reposts of others). I can definitely see me using this blog as the one and only hub for my online communications, but for that to work, I want to be able to keep ephemeral postings outside my regular site and my rss feeds, and more importantly be able to determine intended audiences per posting. Another requirement is that I can post tweets about a blogpost without that tweet being a separate blogpost (now I use the post excerpt for that and send it to twitter)

Currently I have my Mastodon (and my first Twitter account) set to me needing to approve every follower. My audience for a message is somewhat known to me that way, and I can shape a message accordingly. We all talk differently to different people and have conversations in different settings and contexts. This is true for online conversations just as much as for offline conversations. My microblog account does post everything from my blog but I also interact there independently from my blog.

With this plugin, for each posting I can determine if it is cross posted to Mastodon. I already had a similar setting for Twitter (and Flickr, which I don’t use). See the images.

It works as intended. I set the excerpt of this posting to “If all works as intended, this blogpost should show up in my Mastodon instance #wordpress #activitypub”, and set the plugin to post title, excerpt and URL.