How to let a guy know you like him.

I love the idea about the post it's that this guy introduces in this video. It's so amazing, I am trying to come up with a way to tell  guy that I like him, but heres the problem, he lives in another state way across the country. On one hand, I just want to call him and tell him that I like him, and then on the other hand I want to do something a little more subtle like this, But I can't because I don't have his address, if I did, I'd stick it in a letter, and send it to him, and it would be no big deal, but I can't. Anyway, I hope you enjoy the video.