How to wish crush Happy Birthday on Facebook?

just_wondering_01
So it's my crush's b-day and I only have contact with him on Facebook (i don't even see him in real life since I moved). I wanna say happy b-day to him but not sure if I should do it on his wall or in a private message? We used to message but he quit responding to me a few months ago...
Private message
Wall post
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P. S Any advice on what to say would be most appreciated
How to wish crush Happy Birthday on Facebook?
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