In reference to myspace. When one gains knowledge about another's social life via myspace. This is usually done by reading pages and pages of comments and scanning through About Me sections obsessively.
liz: katy broke up with nate and hooked up with sam over the weekend.
kara: when did you talk to katy?
liz: oh i didn't. i just did some serious mystalking.
stalking someone through the guise of myspace, whether it be through multiple page views or scouring of comments (and those left BY said person to others), yet without this person having any idea of the lurking.