"We are certainly investigating; just like we would with any threat case."

More than 750 Facebook users had reportedly cast votes by the time the poll was shut down. The breakdown of the responses was not available. 

The survey was created by an individual using a third-party application that lets users conduct their own surveys, Barry Schnitt, a Facebook spokesman, said.

"People were usually doing trivial polls like asking friends where they should go for dinner or what they thought of a certain movie," Schnitt said.

"Then there was the offensive one created by an individual user."

"Of course we are offended by the content of the poll but objectionable ideas are in the world and, unfortunately, manifest on Facebook."