Is Facebook for Friend Finding, Networking or Online Dating?

It started off as finding old friends. Then networking. Now dating? I've been asked out, via facebook message, twice now. Both guys I'm friends with but can not remember them for the life of me. Since when has facebook been an online dating site? I mean as you all know I got nothing against dating sites, as I've been part of one for (a little) over 2 years now, but on facebook? I don't know if I can get behind this. 


One guy I let down gently. Regrettably later, he just would not get the hint and now I have an inbox full of odd to creepy messages. Ignoring him doesn't even do the trick, he continues to write me. Against majority of my friends advice, I have yet to delete and block him. Facebook love finder #2, I haven't replied to yet. I'm contemplating whether or not I should just ignore the whole thing. I respect the balls this guy has for reaching out, but I just CAN NOT. 


On another note, I think I have a date tomorrow night. Via okc, turns out we have a mutual friend and as you do I looked him up on fb. He seems alright so we'll see how it goes.