penp – I think in America, it’s much more accepted. Things are not as black and white. I know very good girls who use facebook. I’m not saying I recommend it, but I definitely don’t think it’s a reason not to go out with someone. The fact that she dresses tzniusly is much more important than whether or not she uses fb.
At some point, you will need to clarify that you have similar views regarding what you would want your future home to look like in terms of internet, tv and movies. But I don’t think the fact that as a single girl, she is using fb is a reason to reject her, especially if she only uses it for friends (girls).