PHOTOS: Mark Zuckerberg testifies before Congress amid Facebook privacy concerns

<div class="meta image-caption"><div class="origin-logo origin-image none"><span>none</span></div><span class="caption-text">Facebook CEO Mark Zuckerberg testifies before a joint hearing of the Commerce and Judiciary Committees on Capitol Hill in Washington. (Andrew Harnik/AP Photo)</span></div>
Facebook CEO Mark Zuckerberg testified before congress after a privacy leak that affected millions of users.
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