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...

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Facebook Page Administration
500,743 websites

Facebook Page Administration is free to use

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

Identifies administrators for a page which will be able publish data to your wall if you like any content within this page.

Market Share by Top Websites

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

2 Facebook Page Administration is leading in Top 10K Sites.

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 20 other categories.

2 Facebook Page Administration hasn't got a lead over Facebook Like Button in any websites category.

Geography

1 Facebook Like Button is leading in most countries, including Japan, United States, France, Poland and 147 other countries.

2 Facebook Page Administration is leading in Australia, Indonesia, Egypt, Singapore and 10 other countries.