Largest Facebook crash in years

On September 23rd, 135 million people could not access the social media website, Facebook. This software flaw resulted in a block-out period lasting 2 and 1/2 hours starting from 7pm. The site had to be shut down while engineers fixed the problem. The root of the dramatic outage was an automatic system that was designed to help fix such problems--it handled an error condition inappropriately, which forced engineers to take the site offline.