This happen because Mark Zuckerberg finds running the company " Too Stressful"..
It is totally FALSE ISSUE.
This information is based on a fictitious, satrical story publish on WeeklyWorldNews.com, a tabloid-style website ( formely a weekly newspaper ) best known for past scoop.
it isn't a news, it barely even qualifies as a RUMOR.
So, you don't be afraid about this issue. This information I got from http://urbanlegends.about.com/b/2011/01/08/facebook-shutting-down-hoax.htm
Because, I hope Facebook will not Shutdown..