M:Metrics found that a staggering 30.9% of iPhone owners watched mobile TV or video, versus a 4.6 market average, and more than double the rate for all smartphone users, according to M:Metrics. Usage of social networking is also popular among iPhone users: 49.7% accessed a social networking site in January, nearly twelve times the market average. Twenty percent of iPhone owners accessed Facebook, one of the first Web properties to customize its content for the iPhone, versus 1.5% of the total mobile market. Two featured widgets, YouTube and Google Maps are extremely popular among iPhone users: 30.4% accessed YouTube and 36% used Google Maps. In comparison, only one percent of all mobile subscribers accessed YouTube and 2.6% checked out Google Maps.