Imagine this: you walk into a casual dining restaurant for dinner with some friends. The host informs you that there's a short wait for a table - about fifteen or twenty minutes - but they can let you know what the table's ready. They ask for your social security number and without so much as a thought you hand it over. The host scribbles it down on a notepad and says they'll call out your last four when your table is ready. That sounds insane, right? And yet, that's kind of what a lot of us ...
