The number of Americans using Twitter dropped 7.9 percent in October from September 2009, marking the second monthly decline for the social networking site this year, according to research firm ComScore Inc. Twitter Inc., the number three social networking site in the United States, had 19.2 million users in October, ComScore said yesterday. October’s number was still up more than thirteenfold from the year-earlier period. The month-to-month decline contrasted with a 2 percent increase for users of Facebook Inc., the most popular social network. Facebook had 97.4 million US users last month, more than double the amount a year earlier, ComScore said. News Corp.’s MySpace, which ranks second among US social networking users, fell 2.5 percent from the previous month. Article at boston.com.
