Benedict Xvi

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Pope Benedict XVI celebrates Mass in St. Patrick Church in Rome on Sunday, Dec. 16, 2012. (AP Photo/Gregorio Borgia)

Pope Benedict XVI pushes a button on a tablet at the Vatican last December. In perhaps the most drawn out Twitter launch ever, Pope Benedict XVI pushed the button on a tablet brought to him at the end of his general audience Wednesday. It read: "Dear friends, I am pleased to get in touch with you through Twitter. Thank you for your generous response. I bless all of you from my heart." (AP Photo/Gregorio Borgia)

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Vatican spokesman Father Federico Lombardi (left) and Vatican communications adviser Greg Burke present Pope Benedict XVI's Twitter web page (top right) to journalists at the Vatican press hall on Dec. 3, 2012. Pope Benedict XVI will start tweeting in six languages from his own personal handle @Pontifex on Dec. 12. The Vatican said Monday the pope will be using a question and answer format in his first Tweet, focusing on answering questions about faith — in 140 characters. (Associated Press)

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Pope Benedict XVI waves to the faithful during the Angelus prayer he delivered from his studio window overlooking St. Peter's Square at the Vatican on Sunday, Dec. 2, 2012. (AP Photo/Gregorio Borgia)

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Pope Benedict XVI leads a Vespers prayer in St. Peter's Basilica at the Vatican on Saturday, Dec. 1, 2012. (AP Photo/Andrew Medichini)

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Father Federico Lombardi (left), the Vatican's spokesman, and Vatican communications adviser Greg Burke present Pope Benedict XVI's Twitter Web page (top right) to journalists at the Vatican Press Hall on Monday, Dec. 3, 2012. (AP Photo/Gregorio Borgia)

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Pope Benedict XVI presses a touchpad to send a tweet for the launch of the Vatican news information portal www.news.va at the Vatican on Tuesday, June 28, 2011. (AP Photo/Osservatore Romano)

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Pope Benedict XVI arrives to celebrate a Vespers prayer in St. Peter's Basilica at the Vatican on Saturday, Dec. 1, 2012. (AP Photo/Andrew Medichini)

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** FILE ** Pope Benedict XVI presses a touchpad to send a tweet for the launch of the Vatican news information portal www.news.va at the Vatican on Tuesday, June 28, 2011. The pontiff will start tweeting in six languages from his own personal handle, @Pontifex, on Wednesday, Dec. 12, 2012, the Vatican announced. (AP Photo/Osservatore Romano)

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Pope Benedict XVI (seated at center) listens as newly elevated Cardinal James Michael Harvey (second from left) of the United States delivers his speech during a Mass celebrated for the six new "princes" of the church in St. Peter's Basilica at the Vatican on Sunday, Nov. 25, 2012. (AP Photo/Andrew Medichini)