Can someone please tell me what this means?
 

sometimes i see on my japanese friends' myspace, they'd often say something, and then,

"tte", by itself, then another sentence, with nothing before the "tte." so what does it mean? is it just like "like" in english?

Are you saying that this person begins a line with って? If so, I hope you don't imitate that kind of writing. That you won't see many other Japanese do. As for the meaning of it, it should mean "regarding (what was just discussed)".

Oh i see, thank you very much! I figured it was mostly for teenagers and seemed like a non-standard thing... although it seems many teenagers are using that? (and also nde too)

It's mostly used by teenagers and young people, right?

Sure, it's usually teenagers who write like that. I'm not saying all teenagers do it, though. And they certainly aren't allowed to write that way in school. Older guys like myself are only watching our language fall apart. I can't even say 「って」 without anything in front of it.

I see. Thank you very much! I understand it completely now. (and I won't use it, :) don't worry.)

Don't worry, the same thing is happening to English.