This a list of the Top 10 social networking sites in the world. Social networking accounted for nearly 1 in every 5 minutes spent online globally, ranking as the most engaging online activity worldwide. Social networking sites now reach 82 percent of the world’s Internet population age 15 and older that accessed the Internet from a home or work computer, representing 1.2 billion users around the globe, according to a report from comScore, a company specializing in the measurement of the digital world. Other popular microblogging destinations seeing rapid adoption include Chinese site Sina Weibo, with its audience growing 181 percent in the past year to rank as the 10th largest social network in October. Tumblr, which ranked 12th worldwide in audience size, grew 172 percent in the past year.