@MartinSleziak verbs in tags (in action mode) are usually in -ing: 'editing', 'flagging', 'searching', 'voting', 'cross-posting', 'voting', 'formatting' (I think there is no exception on meta-MO). For consistency I suggest to change it to "following-post', or 'following-a-post' (with "a" so as to avoid ambiguity with "next post").

@YCor To be honest, I would prefer consistency with Meta Stack Exchange and other metas. (So that MO users are less confused if they search for information elsewhere. (Typically Meta Stack Exchange and Mathematics Meta have more detailed information than MathOverflow Meta. So I would imagine that MO users have to rely on those quite often.)

On other metas, the tag names that I've seen are follow-post - https://stackexchange.com/filters/389862/follow-post and https://meta.stackexchange.com/questions/tagged/follow-post - and follow-posts - https://stackexchange.com/filters/389861/follow-posts and https://meta.stackoverflow.com/questions/tagged/follow-posts.

So to me this seems as a better name. I will not revert it if you change the name of tag - but I will not actively change it, since in my view this name has some (marginal) advantages.)

If you decide to change the name of the tag, it might be useful to create also tag-info with some basic information. My suggestions can be seen here: https://meta.mathoverflow.net/review/suggested-edits/1550 https://meta.mathoverflow.net/review/suggested-edits/1549