I've been talking to a girl for about two weeks after I met her at a social event. At the event I talked to her for a bit and got her FB, and we've been sending msgs back and forth since (except for a few days when I had to go out of the country and didn't really have time to check FB). Nothing too substantial, but I think she's interested...she responds basically as soon as I send the msg.

I'll be seeing her at a party on Saturday, but my buddy is convinced I should ask her out right now for coffee tomorrow rather than continuing our FB conversation. I know what I would say so I'm not asking for help with that, but I don't know if I've built enough comfort at this point to ask her out. I also don't want to wait too long, because I've done that before too.

TLDR; Ask her out or continue the messaging until Saturday?