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I filled one out a few weeks ago, think it was still optional. I just put linkedin

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... though having said that I have a very google-able name so if someone wants to find my facebook profile it's not very difficult

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I put my Linkedin and my Twitter, don't bother with politicking on my Twitter and my LinkedIn is a hollow sad looking profile. Didn't realise it was optional and just put it in.

Can't wait to get turned away at the border when flying there in a few months for a new job for liking something years ago.