After high-profile accounts have been attacked — including AP's, NPR's and the BBC's — Twitter considers how to thwart hackers and protect users. iStockphoto.com hide caption

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U.S. Rep. Anthony Weiner announces his resignation from Congress on June 16, 2011, in New York. The disgraced former congressman is reportedly considering a run for New York mayor. Richard Drew/AP hide caption

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Popular satirist Bassem Youssef, who has come to be known as Egypt's Jon Stewart, waves as he enters Egypt's state prosecutors office on Sunday. Amr Nabil/AP hide caption

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Egyptians use their mobile phones to record celebrations in Cairo's Tahrir Square, the epicenter of the popular revolt that drove Hosni Mubarak from power in 2011. Twitter was often used to record happenings during the Arab Spring. Mohammed Abed/AFP/Getty Images hide caption

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Best Actress nominee Quvenzhané Wallis is interviewed on the red carpet at the Academy Awards Sunday, when several journalists struggled with the young actress's name. Joe Klamar/AFP/Getty Images hide caption

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Twitter announced its partnership with Vine, a video-sharing app that posts six-second videos onto a tweet, on Thursday, Jan. 24. Marie McGrory/NPR hide caption

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President Obama and House Speaker John Boehner on Nov. 16. Carolyn Kaster/AP hide caption

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