These are public posts tagged with #InstantUpdates. You can interact with them if you have an account anywhere in the fediverse.
MASTODON TIP:
TURN ON NOTIFICATIONS EVERY TIME YOU FOLLOW
THEN you will soon see if the person is for you (and whatever line of thought you followed for in the first place)
THEN TURN OFF NOTIFICATIONS
AND FEEL OK TO FORGET THEM / LEAVE THEM AS FOLLOWED PERSON IN YOUR HOME TIMELINE BUT NOT NOTIFIED!
Here's how to add notification:
https://qoto.org/@freeschool/109031885713138221
I'm going through my whole list and turning notifications on (wish sometimes I had done that at the time of follow!)