Ok, so I just met this girl tonight, through a mutual friend. Long story short, it was basically just the three of us all night, so it was hard to isolate, even though it was a mutual friend who was the "third wheel". We got to talking here and there, but not enough so that I showed REAL interest. I don't have her number, but I am close enough that we can talk through Facebook (after I add her). Or is the best route to just tell our mutual friend that I'm interested?

Any and all advice is greatly appreciated.

Thanks

P.S-I wasn't entirely sure which section to post this under, but felt "opening" fit because I feel like I have to start from scratch with this girl.