So I met this girl at a costume party on halloween (we were both wearing the same costume). Anyway, when the photos from the party were uploaded on facebook, she 'liked' the photo us together. I added her as a friend and we briefly exchanged wall posts. Turns out we had a few mutual friends.

Ever since then, i've been struggling to find ways to re-open her and get her number. I used the 'I just met your twin' opener with some decent success (via pm), but the conversation eventually died. Any suggestions on how I should handle this? It's been over a month since we met, so I'd like to make some moves on this girl before she just ends up being 'one of those people I met once' on my friends list.