Twitter - valuation

http://aswathdamodaran.blogspot.com/2013/11/valuation-myths-young-companies-cannot.html
http://aswathdamodaran.blogspot.com/2013/10/twitter-ipo-why-good-trade-be-bad.html
http://aswathdamodaran.blogspot.com/2013/09/twitter-announces-ipo-pricing-game.html

http://online.wsj.com/news/articles/SB10001424127887324755104579073562166634226