Tel Aviv - Radical Islamist groups are using Facebook and other Internet social networking sites to approach Israelis and try to extract classified, sensitive information from them, Israel's internal security organization said Tuesday. Shin Bet recently received a complaint by an Israeli citizen, saying he had been contacted on Facebook by a man purporting to be a Lebanese merchant, who asked him to pass along classified information in return for payment, warned an Israeli government statement sent to the German Press Agenc