Quoted from http://arstechnica.com/news.ars/post/20080820-battling-pricy-textbooks-with-open-source-texts-social-media.html
#collaboration — 2 posts.
Quoted from http://arstechnica.com/news.ars/post/20080819-buzz-and-newscred-two-different-takes-on-social-news.html