http://pdftribute.net/

http://aideconomics.com/index.php/2013/01/13/twitter-repository-for-pdftribute/

https://twitter.com/search/realtime?q=pdftribute&src=typd

http://neuroconscience.com/2013/01/13/researchers-begin-posting-article-pdfs-to-twitter-in-pdftribute-to-aaron-swartz/

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