Many of Facebook's 33,000 employees work out of the company's Menlo Park headquarters.
Menlo Park police said in a statement: "Avoid the area of the 200 block of Jefferson Drive in Menlo Park". The police reportedly received an anonymous phone call on the bomb threat.
A few buildings have been evacuated and everyone at the company is safe, according to Facebook officials.
Police said they secured a perimeter around the building and diverted traffic during the incident.
The Facebook campus is shown in this aerial
Facebook explain that "the San Mateo County deminers were sent with explosive detection dogs". The Menlo Park police are now searching the building.
"We take the safety and security of our people at Facebook extremely seriously and are glad that everyone is safe", a Facebook spokesperson told Reuters.
There were conflicting reports regarding the number of buildings that had to be evacuated. In April, a lady opened shoot at its base camp in San Francisco, injuring three individuals previously she shot herself dead.
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