The overall usage of social networking sites in the US has increased by a total of 16% from Q2 2008 to Q2 2009.
In addition, female users significantly outnumbered male users in Q2 2009, as nearly half admitted to visiting social networks. Younger users (<35) still hold the reigns as the top segment involved in online networking. However, the 35+ crowd managed to make significant gains in 2009, eating up a larger share of the overall market.
Usage patterns tend to trend towards vists of <1 time per week or 2-6 times per day, which poses an interesting yet important divide in frequency. It would be informative to correlate the type of user with frequency patterns in order to gain a more detailed overview of social network usage.