Top 15 Most Popular Social Networking Sites in 2015, Top 15 Best Social Bookmarking Sites 2015

Here are the top 15 Most Popular Social Networking Sites as derived from our eBizMBA Rank which is a continually updated average of each website's Alexa Global Traffic Rank, and U.S. 

1 | Facebook
3 - eBizMBA Rank | 900,000,000 - Estimated Unique Monthly Visitors | 3 - Compete Rank | 3 - Quantcast Rank | 2 - Alexa Rank | Last UpdatedSeptember 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

2 | Twitter
12 - eBizMBA Rank | 310,000,000 - Estimated Unique Monthly Visitors | 21 - Compete Rank | 8 - Quantcast Rank | 8 - Alexa Rank | Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

3 | LinkedIn
18 - eBizMBA Rank | 255,000,000 - Estimated Unique Monthly Visitors | 25 - Compete Rank | 19 - Quantcast Rank | 9 - Alexa Rank | Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

4 | Pinterest
22 - eBizMBA Rank | 250,000,000 - Estimated Unique Monthly Visitors | 27 - Compete Rank | 13 - Quantcast Rank | 26 - Alexa Rank | Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

5 | Google Plus+
30 - eBizMBA Rank | 120,000,000 - Estimated Unique Monthly Visitors | *32* - Compete Rank | *28* - Quantcast Rank | NA - Alexa Rank | Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

6 | Tumblr
34 - eBizMBA Rank | 110,000,000 - Estimated Unique Monthly Visitors | 55 - Compete Rank | *13* - Quantcast Rank | 34 - Alexa Rank | Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

7 | Instagram
77 - eBizMBA Rank | 100,000,000 - Estimated Unique Monthly Visitors | 49 - Compete Rank | 145 - Quantcast Rank | 36 - Alexa Rank | Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

8 | VK
97 - eBizMBA Rank | 80,000,000 - Estimated Unique Monthly Visitors | *150* - Compete Rank | *120* - Quantcast Rank | 21 - Alexa Rank |Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

9 | Flickr
123 - eBizMBA Rank | 65,000,000 - Estimated Unique Monthly Visitors | 138 - Compete Rank | 139 - Quantcast Rank | 91 - Alexa Rank | Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

10 | Vine
581 - eBizMBA Rank | 42,000,000 - Estimated Unique Monthly Visitors | 237 - Compete Rank | 335 - Quantcast Rank | 1,172 - Alexa Rank |Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

11 | Meetup
596 - eBizMBA Rank | 40,000,000 - Estimated Unique Monthly Visitors | 791 - Compete Rank | 701 - Quantcast Rank | 296 - Alexa Rank | Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

12 | Tagged
702 - eBizMBA Rank | 38,000,000 - Estimated Unique Monthly Visitors | 1,082 - Compete Rank | 615 - Quantcast Rank | 408 - Alexa Rank |Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

13 | Ask.fm
779 - eBizMBA Rank | 37,000,000 - Estimated Unique Monthly Visitors | 2,046 - Compete Rank | 113 - Quantcast Rank | 179 - Alexa Rank |Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

14 | MeetMe
1,457 - eBizMBA Rank | 15,500,000 - Estimated Unique Monthly Visitors | 1,407 - Compete Rank | 635 - Quantcast Rank | 2,328 - Alexa Rank |Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA

15 | ClassMates
1,487 - eBizMBA Rank | 15,000,000 - Estimated Unique Monthly Visitors | 153 - Compete Rank | *285* - Quantcast Rank | 4,022 - Alexa Rank |Last Updated September 1, 2015.
The Most Popular Social Networking Sites | eBizMBA