How can I start a conversation on Facebook without being weird or awkward?

So there's this guy that I really like. How can I start a conversation (through chat or messages) without me seeming weird or awkward., you know? I just don't know how to make it not seem like I'm a weirdo...

Updates:
Well, its just that I've like never really talked to him in person before. We've only had like three or four conversations.

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