U.S. diplomats on Thursday “tweeted” down false rumors they feared might lead to a siege on the American Embassy in Madagascar. State Department officials turned to Twitter feeds after dubious claims appeared on the micoblogging network that Madagascar’s newly ousted president, Marc Ravalomanana, had sought refuge inside the U.S. Embassy in Antananarivo, the Indian Ocean island’s capital. Web-savvy State officials kicked into gear and within minutes, the agency had posted its own “tweets” denying the false reports.