<human>: Can you summarize the given text in a few sentences?

Hey guys, my three flatmates (all female) have recently started hanging out with a new friend, and we sometimes (roughly once a week?) do things together, like mini golf, hanging out at Panera, etc. I really like her, but as I only know her through my flatmates, I am never alone with her. I don't know how to ask her out, I don't want to just do it over Facebook as I think that makes it more awkward the next time I see her (as well as being less "personal"). 

I haven't told my flatmates yet, and they haven't mentioned anything to me about the possibility of me and their friend getting together. They don't often ask me about that kind of stuff though, so maybe they don't want to feel like they're intruding? 

Also I'm not sure if their friend even likes me or not, as I'm not very good at telling this sort of thing but don't want to regret not saying anything. I've been wondering if I should tell my flatmates? Or should I just Facebook their friend and ask her directly and risk it being more awkward when I next see her?
<bot>: Should I tell my flatmates I have a crush on their friend who I'm never alone with, or should I just Facebook her to ask her out?