Updating your location on social media can let your friends know where you are, but they may not be the only ones keeping up with you. According to a CNBC report , Facebook tracks users it deems threatening through a “Be On the Lookout” or BOLO list. Facebook looks through its social network for any potentially threatening comments, as outlined by the report. Those can be nonspecific threats to a Facebook office or one actually targeting specific people. Created in 2008, the BOLO list now contains hundreds of people and is updated about once a week, four former Facebook security employees told CNBC. When placed on the list, Facebook can track users’ locations using their smartphone’s location data collected by the app or their IP address collected by Facebook’s website. Tracking threats is reasonable, but there are no clear outlines as to what a ‘credible’ threat is. For example, the report said a vague complaint like “Fuck you, Mark” could get you placed on the list. Users aren’t...