["Fire officials are investigating reports that sarin, a dangerous chemical, might have been sent to a Facebook mailing facility in Menlo Park, Calif., officials said Monday. Shortly before 11 a.m., the Menlo Park Fire District responded to a Facebook mailing facility at 1195 Hamilton Court after machines there detected the chemical sarin, officials said. The Menlo Park Police Department assisted in securing the area."](https://www.latimes.com/local/lanow/la-me-facebook-sarin-warehouse-fire-officials-20190701-story.html) Maybe I'm clueless because I don't use mail and don't have Facebook, but why would Facebook even have a mail facility? Who the fuck writes to Facebook? And why would they need machines that detect poison chemicals? Is this something the US postal service has too? Honest questions here as this story makes no sense to me.