While Facebook with 162 million U.S. monthly visitors receives most of the public attention given to social networking, the other top four social sites are growing very rapidly with the exception of My space. LinkedIn has grown 58 percent in 2011 to reach 34 million; Twitter grew 13 percent in 2011 to reach 27 million; and the social blogging site Tumblr reached 10 million people a month , growing 166 percent that year. MySpace, in contrast, has been shrinking but nevertheless attracted 40 million visitors a month in 2011. According to ComScore, about 16 percent of the total time spent online in the United States was spent on social network sites, up from around 8 percent in 2007 (ComScore,2011). The fastest growing smartphone applications are social network apps: about 30 percent of smartphone users use their phones to visit social sites.