1) Someone whose social network consists of primarily of friends who did not graduate from college.
2) Someone who does not aspire to earn a college degree.
3) Someone who exhibits lower-class tendencies and behavior, but presumably still has access to the internet.
"Hey dude, how was the bar last night?"
"Not bad, I met a girl and took her home."
"Nice, do I know her? What's she like?"
"Probably not, she's definitely a myspacer."
"Whoa, you'd better get checked for STDs."
"What ever happened to that guy Randy from high school? He was a real fuckup."
"Who knows, he's probably a myspacer."