Among media types, Twitter was brought to a near-standstill on Tuesday afternoon as everyone tried to figure out why a number of prominent magazines had cryptically tweeted "f gwenifill" at the same time. Fair warning: If you're not interested in Twitter, PBS's Gwen Ifill, or computer security, you'll probably find this story long, confusing, and ultimately pointless. But if you are, I think you'll find it long, only somewhat confusing, and ultimately pointful.