This isn't how it works - it connects with Facebook so it can filter out your Facebook friends - the whole idea is that only new people who you don't know can see that you're single and looking to connect.
If I want my romantic life and social life to intermix that will be my decision, not that of some webapp. There is a reason Dating Sites exist separated from Social Sites, and it is not because no one has thought of the idea before.
Personal Preference: Ne'er the twain shall meet.
Just to be clear, it is a good idea, but I personally would not trust that small a level of separation between social and romantic life. There may be a market in it, I am not a member of that demographic.