Bomb threat put Facebook headquarters in the Silicon Valley on tenterhooks. Due to the fear that the bomb was about to go off resulted in the evacuation of the multi-storeyed building.
The building was evacuated as soon as an anonymous call alerting the bomb threat was received. But police could not find any explosives after an hours-long search.
A Facebook spokesperson said that the evacuated building was a building separated from office.
Earlier another company in Silicon Valley, Youtube had faced a similar bomb threat.