According to a study by The Neilsen Company, consumers spent 5.5 hours on social media sites like Facebook and Twitter in December 2009. Just three years ago, the average consumer spent 3. Key points from the study – – The most popular online categories, in order of popularity, are: Social networks, blogs, online games, instant messaging. – Growth from Facebook (200%) and Twitter (368%) trumped overall social networking growth. – Time spent on social media sites by an average US consumer went up 143% in a year. – US has the largest population of social media users (142.1 million), followed by Japan (46.6 million).