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List of social bookmarking websites
Social bookmarking websites are centralized online services which allow users to store and share Internet bookmarks. Such sites typically offer a blend of social and organizational tools, such as annotation, categorization, folksonomy-based tagging, commenting, and interface with other kinds of services like citation management software and social networking sites.
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The World's 21 Most Important Social Media Sites and Apps in 2015
The concepts behind "social networking" aren't anything new - ever since there have been humans, we have been looking for ways to connect, network, and promote with one another - but they've taken on an entirely new meaning (and momentum) in the digital age.
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Popular Social Networking & Business Networking Sites | Online Social Networking
My list of social and business networking sites is updated when online social networking changes occur. If I omitted sites you feel should be included, please leave a comment. This article about top social and business networking sites is sponsored by the Small Business Network , a new social website for open business networking and lifetime business learning.
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40 Most Popular Social Networking Sites of the World
Editor's Note (4/13/2015): This post has been updated. Please be sure to take a look at our most recent list of the world's most important social media sites as of 2015. "Social networking" has been around forever. It's the simple act of expanding the number of people you know by meeting your friends' friends, their friends' friends and so on.
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1 | Facebook
3 - eBizMBA Rank | 900,000,000 - Estimated Unique Monthly Visitors | 3 - Compete Rank | 3 - Quantcast Rank | 2 - Alexa Rank | Last Updated October 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 October 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 October 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 October 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 October 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 October 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 October 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 October 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 October 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 October 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 October 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 October 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 October 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 October 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 October 1, 2015.
The Most Popular Social Networking Sites | eBizMBA