Facebook Connect
4,940,298 websites

Facebook Connect is free to use

http://developers.facebook.com/connect.php

Facebook Connect allow users to connect their Facebook identity, friends and, privacy to any website. Facebook Connect is Facebook's first attempt to allow access to Facebook user data outside of Facebook itself. The company is describing ...

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Facebook Social Plugins
3,185,744 websites

Facebook Social Plugins is free to use

http://developers.facebook.com/docs/plugins/

See what your Facebook friends have liked, shared, or commented on across the Web. This includes all variations of Like, Share and Follow Buttons, Embedded Posts, Comments, Activity Feed, Recommendations Feed, Recommendations Bar, Like Box...

Market Share by Top Websites

1 Facebook Connect is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.

2 In terms of market share, Facebook Social Plugins is clearly lagging behind, losing to Facebook Connect in all segments.

Websites Categories

1 Facebook Connect has better usage coverage in more websites categories. Including Computers Electronics & Technology, Arts & Entertainment, Science & Education, Lifestyle and 19 other categories.

2 Facebook Social Plugins is leading in News & Media.

Geography

1 Facebook Connect is leading in most countries, including United States, United Kingdom, Brazil, France and 155 other countries.

2 Facebook Social Plugins is leading in Japan, Iran, Yemen, Syrian Arab Republic and 2 other countries.