Russian President Dmitry Medvedev, sends his first tweet as Twitter co-founder Biz Stone(R) and Evan Williams(L) look on at the Twitter headquarters in San Francisco, California, on Wednesday, June 23, 2010. President Dmitry Medvedev will tour Silicon Valley looking for connections and investments for what he envisions as a Silicon Valley of sorts just outside of Moscow. He will meet with leaders of Cisco, Apple, Google and Twitter. AFP PHOTO/ Tony AVELAR