Facebook Comments
333,844 websites

Facebook Comments is free to use

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

Facebook's Comments box lets people comment on content on your site using their Facebook profile and shows this activity to their friends in news feed. It also contains built-in moderation tools and special social relevance ranking.

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Lockerz Share
191,792 websites

Lockerz Share is free to use

http://share.lockerz.com/

Help visitors share, bookmark and subscribe to your content with Lockerz Share, the worlds best sharing platform for websites and apps.

Market Share by Top Websites

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

2 In terms of market share, Lockerz Share is clearly lagging behind, losing to Facebook Comments in all segments.

Websites Categories

1 Facebook Comments has better usage coverage in more websites categories. Including Computers Electronics & Technology, Arts & Entertainment, News & Media, Community & Society and 17 other categories.

2 Lockerz Share is leading in Science & Education, Law & Government and Adult.

Geography

1 Facebook Comments is leading in most countries, including Russia, Vietnam, Brazil, India and 113 other countries.

2 Lockerz Share is leading in United States, Japan, Italy, France and 42 other countries.