Slack co-founder’s daughter reported missing, believed to be in San Francisco’s Tenderloin district

"The 16-year-old child of billionaire Slack co-founder Stewart Butterfield vanished and is feared to be in one of San Francisco’s most notoriously dangerous neighborhoods. Mint Butterfield, 16, was last seen at 10 p.m. Sunday in Bolinas, Calif., according to Marin County Sheriff’s Office spokesperson Deputy Jose Suarez. Butterfield’s mother, Flickr founder Caterina Fake, reported the teen missing on Monday, according to the San Francisco Standard. "