Last week, Natasha Tynes complained about a public transit employee eating on a train. Of course, that’s not all she did, or I wouldn’t be writing this installment of the newsletter about her. She also took a picture of that employee with her smartphone, then posted it to Twitter, and tagged the woman’s employers, wanting to know what they intended to do about it. And, for a while, it looked like the Washington, D.C., public transit authority was going to take Tynes’ complaint seriously. The social media world, however, had other ideas, and by the end of the day, Tynes...