It doesn't. They say so themselves.
Kinda makes a lie of this:
"In a statement given to CNN, Facebook said a "note" by Palin about her opposition to building a mosque near New York City's Ground Zero had been deleted by an automated system.
"The note in question did not violate our content standards but was removed by an automated system," Facebook spokesman Andrew Noyes said in the statement. "We're always working to improve our processes and we apologize for any inconvenience this caused."