Top 15 most popular social networking sites

Top 15 most popular social networking sites,

1. Facebook : Monthly Active Users: 1,100,000,000
2. Twitter : Monthly Active Users: 310,000,000
3. Linkedin : Monthly Active Users: 255,000,000 
4. Pinterest : Monthly Active Users:  250,000,000 
5. Google Plus + : Monthly Active Users: 120,000,000
6. Tumblr : Monthly Active Users: 110,000,000
7. Instagram : Monthly Active Users: 100,000,000
8. VK : Monthly Active Users: 80,000,000
9. Flickr : Monthly Active Users: 65,000,000
10. Vine : Monthly Active Users: 42,000,000
11. Meetup : Monthly Active Users:  40,000,000 
12. Tagged : Monthly Active Users: 38,000,000
13. Ask.fm : Monthly Active Users: 37,000,000
14. MeetMe : Monthly Active Users: 15,500,000
15. ClassMates : Monthly Active Users: 15,000,000

Source: http://www.ebizmba.com/articles/social-networking-websites