voice diminished it s been almost three decades since the brilliant wall came down and discoveries like a secret tunnel entrance show that history in berlin remains very much alive and relevant as long as the stories are told. and talking of stories being told joining me now is one of the few english speaking journalists who was there and i was here in berlin on the night of november ninth and nine hundred eighty nine when the berlin wall fell and it happens to be our very own culture editor robin merrill good to see america share with us your experience of that fateful night oh to be there slightly embarrassing because everybody else are surprised don t forget there were no mobile phones in those days communication was different now i was working for the allied radio station b. f.b.s. the british radio station and on the evening of the ninth of november i was invited for dinner at a very high ranking officers. and i went to there were quite
was not too happy with the prospect of me getting kicked out of school. what does your father say now about what fb fbs has become and zuckerberg likes to make fun of my dad for this but we re still very close. reporter: instead he followed his politics and worked for john kerry s presidential campaign. colleagues call that decision green s $400 million mistake. his share if he had helped start facebook. i was like what about the content? reporter: but he s back in the facebook fold, running a company called causes. it s a facebook application and website which lets friends suggest to friends a charity, a social cause, even a candidate. the way to get people civically engaged, you know, not just during an election but throughout the year is to tap into facebook and to let them do it with their friends. thank you, mark. reporter: as candidate obama proved, social media is a powerful political tool. you can t ignore it. it would be like ignoring television or ignoring