How to someone to notice you via Facebook?

[G]

How do I get someone to desire me!?! I met this guy a while back and we friended on Facebook, we haven't spoken in a while but the whole time I've known him I've wanted to ask him out on a date! It's gotten to a point now that it's been SO long that it wouldn't just be awkward to ask him out but kind of strange for me to come out of the blue like this! I don't even think he thinks of me that way... But I want him so much and I find it so frustrating sometimes I literally want to throw myself to the ground and have a tantrum because I don't know what else to do. I steal looks at his picture throughout the day, I long and I pine. He's never online so I can't even try to strike up a casual conversation! Someone give me some tips and tricks to get a guy interested via social media, otherwise I might have to become the stalker type!
Lol! Robert! "The worst he could do.. Is say no or ignore the message." That's what I'm scared of! Cos not only is that humiliating but then I STILL don't get a date = no kissing for G = temper tantrum + more pining. Maybe I'll give the poke thing a go "arghh!!" Thanks guys