Replied to a post by Ton Zijlstra
I use Mastodon Autopost (github.com/simonfrey/mastodon_wordpress_autopost) for this.Β  (I think originally came across it via Chris Aldrich).Β  You can choose per post whether you want to post to your instance.Β  I also added a couple of very hacky functions (github.com/ngm/semloop/blob/master/includes/syndication-targets.php) to add it as a Micropub syndication target.