A double outage hit Twitter on Thursday, as users worldwide reported down-times and slow service across the website and mobile applications of the platform.
At approximately 9:00am PDT (Thursday), Twitter said it discovered that its microblogging site inaccessible for all web users, and mobile clients were not showing new Tweets. Twitter found that the reason for the downtime was "a cascading bug" in one of its infrastructure components, adding that it
wasn't due to a hack or its new office or Euro 2012 or GIF avatars, as some have reports speculated.
A "cascading bug" is a bug with an effect that isn't confined to a particular software element, but rather its effect "cascades" into other elements as well. One of the characteristics of such a bug is that it can have a significant impact on all users, worldwide. In order to solve the issue, Twitter rolled back to a previous stable version of Twitter.
The company added that the service was fully recovered at 11:08am PDT.