A man holds a smartphone showing Pope Francis' first tweet in front of a computer screen showing the same tweet on March 17, 2013 in Rome. Pope Francis issued his first tweet on Sunday shortly after performing his first Angelus prayer, with a consistent message: "Pray for me". "Dear friends, I thank you from my heart and ask you to continue to pray for me," the Argentine pope tweeted from the @Pontifex account.  AFP PHOTO / GABRIEL BOUYS        (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)