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.

VS

Google +1 Button
597,414 websites

Google +1 Button is free to use

https://developers.google.com/+/web/+1button/

Let visitors recommend your content on Google Search and share it on Google+.

Market Share by Top Websites

1 Google +1 Button is leading in The Entire Web.

2 Facebook Page Administration is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.

Websites Categories

1 Google +1 Button has better usage coverage in more websites categories. Including Computers Electronics & Technology, Arts & Entertainment, Science & Education, Travel & Tourism and 13 other categories.

2 Facebook Page Administration is leading in Food & Drink, News & Media, Law & Government, Sports and 3 other categories.

Geography

1 Facebook Page Administration is leading in most countries, including United States, Japan, France, United Kingdom and 100 other countries.

2 Google +1 Button is leading in Italy, Russia, Spain, Taiwan and 57 other countries.