Sources: Facebook keeps a "lookout" list of ex-employees and users who made threats against the company, and sometimes uses its products to track their location (Salvador Rodriguez/CNBC)

Salvador Rodriguez / CNBC:
Sources: Facebook keeps a “lookout” list of ex-employees and users who made threats against the company, and sometimes uses its products to track their location  —  - Facebook maintains a list of individuals that its security guards must “be on lookout” for that is comprised …