Many cities have hotlines where citizens can report getting food poisoning from restaurants, but not everybody uses them. So, in a recent project, the city of Chicago sought food poisoning cases by setting an algorithm to mine Chicago-area tweets for complaints. The Chicago Department of Public Health's Twitter bot, plus a new online complaint form, helped the department identify 133 restaurants for inspections over a 10-month period. Twenty-one of those restaurants failed inspection and 33 passed with "critical or serious" violations. Not a bad haul.