Facebook has 1.4 billion profiles, and 1.06 billion of those (or 15 percent of the world’s population) use Facebook regularly. Of those, 78 percent of users access Facebook on a mobile device a minimum of once a month.
Every second, there are 8,000 likes on Instagram. Instagram launched in 2010, and boasts 200 million active users in 2014, with over 75 million users daily.
Google+ has over 540 million profiles and over 300 million monthly active users.
LinkedIn, launched in 2003, has 300 million users, and an average of two new members per second. Forty percent of users on LinkedIn check the site daily, and Mashable is the LinkedIn company with the most engaged following.