I want to talk to him.. But the only way I have is facebook. But he hasnt answered yet. HELP!! :/?

I want to talk to my crush.. Ive talked to him like 3 times before in school but now were outa school and I dont have his #. I wrote on his wall and asked about some college cles cause I thought that would be a good ice breaker. Well he hasnt written back and that was on friday. What do I do now? I want to talk to him really reallly bad :/ cause I like him. Im just really scared of annoying him. What do I do?