update Social-networking giant Facebook is mopping up this morning after pre-release prototypes were set loose on some users, forcing administrators to take the site offline.
The resulting global outage saw the social network take to short social messaging service Twitter to apologise to users.
"Facebook is available again after being down for a brief period. We apologise for the inconvenience," Facebook's official Twitter account said in a tweet.
Minutes later, however, Facebook aired another tweet, explaining the reason for the outage.
"Some internal prototypes were exposed to people and resulted in us disabling the site briefly," it admitted.
"It's now back to normal," it assured users.
Representatives for Facebook couldn't reveal details on which pre-release features had been exposed or how they were outed in the first place, but said that no private user data was leaked as a result of the fault.
The outage comes a day after Facebook founder, Mark Zuckerberg, was named Time magazine's Person of the Year.
Updated at 11:38am, 17 December 2010: added comment from Facebook representatives