What does creeping mean?

[thankfulcable742]

like on twitter loads of people tweet about justin bieber tweeting (sorry bieber haters) like this:
@justinbieber is creeping and I like it.....please creep...or flip your hair a couple timess..hahah
haha...you guys see @kennyhamilton creeping in the background. such a creeper.
Creeping on tweets is really entertaining, no wonder @justinbieber does it

lol this may sound silly but can somebody tell me what it means??? thank youu xxx

[bohogirl1]

buy creeping mugs, tshirts and magnets
Following what is going on in someone's life by watching their status messages on Instant Messengers such as MSN, and their updates to their social networking profiles on websites like Facebook or MySpace. Akin to stalking in the real world, but usually done to people who are your friends that would normally share this information with you, however you're just too busy to keep up conversation with them.
I see you've got a new cat, dumped your girlfriend, moved to a new apartment, had a fight with your sister, and your goldfish died. Yes, it's true, I've been creeping you, just been so busy with finals that I haven't had a chance to call or write until now.