What is that app called where you take a picture and there are two of you

It's an app for the iPod/iPhone. Where you take a picture and you can do this cool crazy effect where there are two of you. :3

I really want to know because my friends and all have been doing it. But they tantalize me and won't give me the name. D: thank you.

There's multiple. But most popular is prob camwow

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