Facebook Social Graph
271,051 websites

Facebook Social Graph is free to use

https://www.facebook.com/about/graphsearch

Now you can find more of what you're looking for on Facebook and discover fun connections between people, places and things.

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Pinterest
292,411 websites

Pinterest is free to use

http://pinterest.com/

Pinterest is a social networking site with a visually-pleasing virtual pinboard interface. Users collect photos and link to products they love, creating their own pinboards and following the pinboards of other people whom they find interest...

Market Share by Top Websites

1 Pinterest is leading in Top 1M Sites and The Entire Web.

2 Facebook Social Graph is leading in Top 10K Sites and Top 100K Sites.

Websites Categories

1 Pinterest has better usage coverage in more websites categories. Including Food & Drink, Lifestyle, Home & Garden, Hobbies & Leisure and 13 other categories.

2 Facebook Social Graph is leading in Arts & Entertainment, Science & Education, Computers Electronics & Technology, Community & Society and 3 other categories.

Geography

1 Facebook Social Graph is leading in most countries, including United States, United Kingdom, Canada, Taiwan and 86 other countries.

2 Pinterest is leading in Japan, France, Brazil, Argentina and 64 other countries.