La explicación de Twitter sobre la incidencia de ayer http://t.co/U6tpbpw4
June 22, 2012
Not how we wanted today to go. At approximately 9:00am PDT, we discovered that Twitter was inaccessible for all web users, and mobile clients were not showing new Tweets. We immediately began to investigate the issue and found that there was a cascading bug in one of our infrastructure components.
http://blog.twitter.com/2012/06/todays-turbulence-explained.html?m=1

