AddThis
629,840 websites

AddThis is free to use

http://www.addthis.com

AddThis, the new brand name for Clearspring Technologies, is the leader in socially connecting publishers, services and advertisers to audiences on the open web. Reaching more than 1.3 billion unique users monthly, AddThis’ social tools and...

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Facebook Like Button
1,046,401 websites

Facebook Like Button is free to use

https://developers.facebook.com/docs/plugins/like-button/

Facebook's Like button is the quickest way for people to share content with their friends. A single click on the Like button will 'like' pieces of content on the web and share them on Facebook. You can also display a Share button next to t...

Market Share by Top Websites

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

2 In terms of market share, AddThis is clearly lagging behind, losing to Facebook Like Button in all segments.

Websites Categories

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

2 AddThis is leading in Adult.

Geography

1 Facebook Like Button is leading in most countries, including Japan, France, Poland, Brazil and 120 other countries.

2 AddThis is leading in United States, United Kingdom, India, Australia and 35 other countries.