List of Domains with Google PageRank 10

Google updated Pagerank database in august 2011. Here is a list of top 10 Domains with Google PageRank 10.

google.com

facebook.com (social media)

cnn.com (us-american news company)

addthis.com (social bookmarking script)

miibeian.gov.cn (Chinese Goverment)

gmodules.com (a service of Google)

usa.gov (US Goverment)

hhs.gov (US-Department of Health and Human services)

unesco.org

piwik.org (PHP-Mysql based real time web analytics software, open source alternative to Google Analytics)

There are some strange things for me. Example: Why Twitter didnt get PR-10? Why CNN get 10 and BBC not? Why gmodules get 10 even it redirects index page to Google self? And how can chinese site get 10 with many html errors in their index page? Example: miibeian.gov.cn has 2 doctype declarations in same homepage.