I don't know if that counts as trolling or just being obsessive and harassing. I say that because trolls are doing it for fun. I have had the above example happen to me, and I've seen it happen to others. I think it's often someone who is lacking some self control, has an interaction that is bad, and then sort of obsesses, even possibly thinks they are protecting themselves. However, that behavior gets reported, usually, and handled. But it could also be trolling. Which is why it's good to report it.

I don't think simply following a member is trolling. I often read a post then look at their other comments to get some context, and that may prompt me to comment in multiple places. That's not an intent to troll them or harass them, it was sort of product of my thought process to try and get context and then finding I had something to share on those other threads as well.

Yes, I have had it happen to me. I won't share my story because it became an administrative thing to deal with, and they did deal with it, and I was very grateful.

In regards to advice about dealing with trolls: Don't feed the trolls. They thrive on interaction. If you ignore them and just continue to be positive, eventually they move on. Just do not even acknowledge their presence once you determine they are trolling. They lose interest when they can't get a rise out of you.