"In August 2009, 17 percent of all time spent on the Internet was at social networking sites, up from 6 percent in August 2008.
Among those taking note of this trend: advertisers. Estimated online advertising spending on the top social network and blogging sites increased 119 percent, from approximately $49 million in August 2008 to approximately $108 million in August 2009 – all despite a recession. Share of estimated spend on these sites has doubled, from 7 percent of online ad spend in 2008 to 15 percent in 2009."