Im looking to expand my social circle and hang out with women that I don't currently hang out with (putting gaming them aside for the moment however things change

)
I have some emails and numbers of girls im not in touch with but I want to become their friends like for example, one of my friend's girlfriend, who I sometimes talk to, is pretty hot and has a lot of friends, so I figure she must have hot friends. Like I said I talk to her but never hang out with her alone.
Most of these women are friends on my facebook, so I would need to message them.
What are some suggestions for getting to hang out with these facebook girls?
Im stuck guys,
Thanks.