He said he thought he launched the camera unintentionally, but then found it a second time, CNN reported.
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Facebook confirmed the issue and said a fix is forthcoming.
"We have seen no evidence of photos or videos being uploaded due to this bug. We're submitting the fix for this to Apple today," a Facebook spokesman told CNN.
A security expert recommend that until the fix is rolled out that users deny Facebook access to their iPhone camera.
The issue only affects iPhone devices, not Androids, CNN reported.