VATICAN CITY, VATICAN - MAY 18:  Pope Benedict XVI meets President of Poland Lech Kaczynski at his private library on May 18, 2009 in Vatican City, Vatican. The Pope this week has welcomed leaders from Bulgaria, Poland and Macedonia as well as joining the online social networking site, Facebook, in advance of celebrating World Communications Day this Sunday. Getty Images logo Getty Images 6 months ago

VATICAN CITY, VATICAN - MAY 18: Pope Benedict XVI meets President of Poland Lech Kaczynski at his private library on May 18, 2009 in Vatican City, Vatican. The Pope this week has welcomed leaders from Bulgaria, Poland and Macedonia as well as joining the online social networking site, Facebook, in advance of celebrating World Communications Day this Sunday.