1. Krikorian R. Twitter by the numbers. 2010. http://www.slideshare.net/raffikrikorian/twitter-by-the-numbers.
2. Tam D. Facebook processes more than 500 TB of data daily.2012. http://www.cnet.com/news/facebook-processes-more-than-500-tb-of-data-daily/
3. Wikipedia, Petabyte.2014. http://en.wikipedia.org/wiki/Petabyte
4. Low Y,Gonzalez J,
Kyrola A,
Bickson D,
Guestrin C,
Hellerstein JM. Graphlab: A new framework for parallel machine learning. ar Xiv preprint ar Xiv:1006.4990. 2010.
5. The apache software foundation, what is apachemahout. 2014. http://mahout.apache.org/