Ernst and Young has a study about IPOs called
in which they state that:
Successful companies usually begin to act like a public company at least a full year prior to going public.
Do you believe that Twitter has been acting like a public company for at least a year?
( Link to Top 10 IPO readiness challenges: A Measures that matterSM global study executive summary - http://www.ey.com/Publication/vwLUAssets/Top_10_IPO_readiness_challenges_10/$FILE/2_Top%2010%20IPO%20readiness%20challenges%20a%20Measures%20that%20Matter%20study.pdf )