the same person keeps adding me on last.fm, every monday for the past 3 weeks i've got a friend request from the same person but on different accounts.

http://www.last.fm/user/Shanta90
http://www.last.fm/user/Keerena
http://www.last.fm/user/Knoush

they change their name, location and age every time but they listen to exactly the same music so i think they just scrobble one computer to loads of different accounts.

what should i do?