I don't think it counts as spamming if someone posts in every single thread but always on topic or taking part in conversation. If all or most of the posts are irrelevant and not part of any discussion, I think that's spamming. Like when Silvine would just try to make every thread about him, or just keep posting and posting **** that nobody was reading or responding to...
I can't answer the harrassment questions though.
Tobias Fünke: So what are your plans for this evening?
Bob Loblaw: I thought that maybe I would stay in and work on my law blog.
Tobias Fünke: Ah, yes. The "Bob Loblaw Law Blog". You, sir, are a mouthful.