After the fixing of this problem, Twitter wrote an apologized post on its blog.
According to them “We are sorry. Many of you came to Twitter earlier today expecting, well, Twitter. Instead, between around 8:20am and 9:00am PT, users around the world got zilch from us.
By about 10:25am PT, people who came to Twitter finally got what they expected: Twitter. “
“The cause of today’s outage came from within our data centers.
Data centers are designed to be redundant: when one system fails (as everything does at one time or another), a parallel system takes over. What was noteworthy about today’s outage was the coincidental failure of two parallel systems at nearly the same time. “