Why can't i use emoji's in my twitter name or bio?

I have an iphone 4s (with the latest ios version) and i can pretty much use emoji's everywhere, except in my twitter name or bio! Other people use emoji's in their name, but when i try it stays for a second and then it won't show up. Any way to solve this?

What it is, is that some of the emojis work and will show up and some won't.might i add which sucks… But you just half to play around with it to see which work and not!

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