My iPhone 4 won't screenshot?

Whenever I try to screenshot something on another app like instagram my phone will make the picture sound like normal but then when I go to my pictures the picture isn't there. Why is my phone doing this? I'm starting to get really aggravated and i'm about to throw my phone out a freaking window

Make sure your phone's storage isn't full. Try deleting about 10 pictures and then see if your screenshot will save. If it still won't save don't throw your phone out a window just backup and restore using itunes.

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