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+ Platform
1,016,622 websites

Google+ Platform is free to use

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

Google+ platform websites integration using the Google+ platform tag.

Market Share by Top Websites

1 Google+ Platform is leading in Top 1M Sites and The Entire Web.

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

Websites Categories

1 Google+ Platform has better usage coverage in more websites categories. Including Computers Electronics & Technology, Arts & Entertainment, Science & Education, Games and 20 other categories.

2 Facebook Page Administration hasn't got a lead over Google+ Platform in any websites category.

Geography

1 Google+ Platform is leading in most countries, including United States, Japan, India, Brazil and 156 other countries.

2 Facebook Page Administration is leading in Israel, Slovakia, Austria, Iceland and 2 other countries.