TOP 10 Most Visited Social Media Sites in 2017 Facebook This is the biggest social media network on the Internet, both in terms of total number of users and name recognition. Founded on February 4, 2004, Facebook As of the third quarter of 2017, Facebook had 2.07 billion monthly active users . In the third quarter of 2012, the number of active Facebook users had surpassed 1 billion, making it the first social network ever to do so. Active users are those which have logged in to Facebook during the last 30 days. It is estimated that more than 1 million small and medium-sized businesses use the platform to advertise their business. YouTube YouTube — the largest and most popular video-based social media website — was founded on February 14, 2005, by three former PayPal employees. It was later bought by Google in November 2006 for $1.65 billion. YouTube has over 1 billion website visitors per month and is the second most popular search engin...