I'll check out a girl's FB profile if I have it before dating her. On more than one occasion it has given me some major red flags, and I just called off the date before it began. No point wasting time or money. On the other hand, some positive stuff on a girl's FB profile is an attraction trigger to get to know her more, and I bring up related topics in the date without telling her where I got the info from. The key is to be subtle and bring up things in the form of a question, instead of stating specific facts about her that I wouldn't know unless I checked her profile first. Girls check your's out all the time, trust me.
John Michael Kane's Datasheets: Master The Credit Game: Save & Make Money By Being Credit Savvy
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Try not to become a man of success but rather to become a man of value. -Albert Einstein