@dave007,
Facebook is generally a place where you already know to some degree your friends. This person is a friend of a friend of a friend. I think there is a slim chance that romance can be found in this part of the Facebook realm. Slim but close to impossible. If this is the case then you need to have far more in common then a few dozen corporate/music likes.
If there isn't a certain degree of acquaintanceship between you and your Facebook friend you are trying to hook up with then I believe your chances are even worse. Either way, I think one has the same chances finding love on a dating site as you can find on Facebook.
That said, you're likely here to spam for that ebook and don't really care about finding a soulmate online.