It's more than 1 person.

Its starting to feel like im being stalked by them, but in a subtle way that others wouldnt notice.

Example is when you write about a trauma because, well it was traumatizing and its still affecting you. Lets say you were walking down a dark street and got attacked, so you talk about it here. Then people on the thread start posting' "i walked down a dark street many times and never got attacked". Then the same people 'like' the posts that negate you. Amd these people may not post often but always seem to appear or come around when there is an opportunity to put you down, invalidate or gaslight you.