Facebook CEO Mark Zuckerberg received a less than warm welcome in Washington, DC, where he testified before a joint hearing of two Senate committees Tuesday. Among the crowds of spectators lining up to watch Zuckerberg get grilled were members of the activist group CodePink, wearing oversized sunglasses with the words, "Stop Spying," written across them. Another group wore t-shirts with the hashtag #DeleteFacebook scrawled on them in red Sharpie.

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