According to TMZ, "the photo was accidentally uploaded publicly on Facebook by Facebook Director of Engineering Andrew Bosworth and deleted 'seconds later'. But someone took the grab and the image surfaced on the image-sharing site imgur."
Zuckerberg out of richest tech billionaire list as Facebook shares slide
Recently, Federal Trade Commission ruled that Facebook will be subjected to two decades of regular privacy checkups and other penalties.
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With this accidental leak, Zuckerberg seems to have been caught in his own web.