Saving photos from facebook iOS 6.1

Hey, i cant remember if this was possible on older OS's but wont happen on FB.
i click a pic on my phone till it enlarges, press and hold pic and choose 'save photo' as shown in pic
I look in camera roll and its not there. im aware i can screenshot, but then i get the surrounding black areas
I try it on twitter and saves pics fine. so why not on facebook?

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