What do you mean "all of that Panda guy's threads"? I thought it was always the same one, posted over and over. And over. And over. And oooover.
OVER WHAT? WHAT ARE YOU SAYING?
I'm sorry, but this is somewhat true. As an asker, you should always ask for the other person's number, regardless of whether you're a girl or a guy asking out a guy or a girl. It's much more strategic.
I guess, it's not like he can't get her number now. It is kinda weird to give a girl your number and not get hers in return, though. If they're talking through facebook and have nothing planned, I don't see why they'd even need each other's numbers.
Edit: Come to think of it, anyone I've met that I've talked to online I've met at least once in person. So I'm going to throw out what was edited in before. Apologies!