i had a previous employer stalk me on the internet, and troll me, and harass me, to the point i actually was compelled to contact my local police department and convinced a deputy (who i know personally, grew up playing with his kids when i was younger) to actually call this man and let him know that 'stalking' will not be tolerated whether in the physical world or in cyberspace.
but, to this day, he still finds me on websites i have contributed to and frequented for years, and delivers veiled potshots at me. it's kind of annoying. i tell him he has a gay crush on me and it seems to make him stop for awhile.