I don't think you know what following is meant for - it is a way to read someone's posts that doesn't post that often, that you find interesting for some reason. It's not meant as harrassment.
Ossobuco - you amaze me. There's not a single trait in common between you and the stalker in question - other than you both post on this site. It's been years since I read any of his posts or had any other interaction with him - hardly your case. At the time I thought him severely unhinged, possibly bordering on dangerously so, and promptly put him on ignore. Again, not your case at all. Finally, after I received the first A2K notice that he's following me - viz. previous pages, that was several months ago - I posted here and asked that he please stop doing so. That's really the determining factor, in both law and jurisprudence, in distinguishing between actual stalking (always an offense, criminal or civil depending on state law) and simple interested following (both legal and legitimate). Look up the several applicable laws for cyberstalking as well as the real-life variety: one criterion which always comes up is whether the follower was asked to ceease and desist and refused.
The record here is self-explanatory; so I propose to say not another word on the matter as far as he's concerned.
You, however, a're a friend and I'm always happy to read your posts. If you wish to follow me please go ahead; I'd like to reciprocate but you post a lot on cooking threads so I'd have to manually skip those - too much trouble. Thanks for your attempt at software clarification