Tell a guy that i like him on fb chat?

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There is a guy at my school, i've had a crush on him on like 2 years, and i think he likes me too. I want to tell him at school that i like him but he is always with his friends and i want to tell him privately but i got his fb and we chat sometimes. Whats the best way to tell him that i like him on fb chat? "(insert name here), i like you ^^" or "I kinda like you..." or "I think your cute" (i dont like him just cuz his cute! its much more than that)
or something like that? what should i say? just I like you? or "I know something about you ^^" and then tell him that i like him? whats the best thing to write?