Facebook uses its apps to track users it thinks could threaten employees and offices
Several of the former employees questioned the ethics of Facebook's security strategies, with one of them calling the tactics "very Big Brother-esque."
Facebook notifies its security professionals anytime a new person is added to the BOLO list, sending out a report that includes information about the person, such as their name, photo, their general location and a short description of why they were added.
Users who publicly threaten the company, its offices or employees — including posting threatening comments in response to posts from executives like CEO Mark Zuckerberg and COO Sheryl Sandberg — are often added to the list.
Facebook has the capability to track BOLO users' whereabouts by using their smartphone's location data collected through the Facebook app, or their IP address collected through the company's website.