Why can't I see emojis on twitter on my iPhone?

I can see them in text messages, i can put them in my tweets, and I can see them in literally every other app, but when it comes to twitter all I can see are question marks. Even when I look up my own tweets with emojis in them, they won't show up. I have an iPhone 4 running the latest iOS. What the heck is going on?

First please download aplication then, switch off ph and on

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