By Walt Hickey Welcome to the Numlock Sunday edition. This week I spoke to Ryan Broderick, who wrote “Twitter invented a Clippy for cyberbullying” for his newsletter Garbage Day. Here's what I wrote about it: A new study by Twitter released the results of the sitewide experiment where users about to tweet something heinous or aggressive were prompted with a brief question asking if they’d like to reconsider that message before sending. Turns out the nudge really works: Of those nudged, while 69 percent did just send it,