Erna Solberg replies to her followers more often than her European colleagues
© EPA/VEGARD GROTT Barack Obama opened his account on Twitter in March 2007, a year after the social network appeared
© EPA/MICHAEL REYNOLDS Now US President has almost 44 million followers
© EPA/JIM LO SCALZO Belgium's Prime Minister Elio Di Rupo was also one of the first politicians to open an account on Twitter in 2007
© EPA/DIRK WAEM Russian Prime Minister Dmitry Medvedev together with Erna Solberg are the only two political leaders mutually followed Twitter by US President Barack Obama
© ITAR-TASS/Dmitry Astakhov French Foreign Minister Lauren Fabius has become the best connected foreign minister
© EPA/YOAN VALAT Swedish Foreign Minister Carl Bildt (left) was the best connected minister on Twitter in 2013
© EPA/ABEDIN TAHERKENAREH Pope Francis is the second most followed world leader on Twitter after US President Barack Obama
© EPA/ETTORE FERRARI Pope Francis has 14 million followers
© EPA/CLAUDIO PERI