No matter what the device, Facebook remains top dog across the board overall – account ownership, active usage and visit frequency, across all regions — although it has seen minor decline as other social networks gain mindshare. The key winner in this year’s new class of social networks is Instagram: A nearly 25% rise in active users betwen Q2 and Q4 of 2013 bring the estimated total of active users on the website to more than 90 million. It’s also popular for the kids, too, as teens represent the dominant demographic on the site, with a 39 percent share of active users. According to GWI, the only other social networks that can boast teens as their dominant users are Youtube and Tumblr.