To illustrate his point, Erlin had me go to a site called Mylife that collects publicly available data on millions of people. It's unclear to me what Mylife purports to do, but I was not happy to see that it listed the names of several close family members, the exact addresses of the last six places I've lived, many of my old phone numbers, my age, recent employers, and more.
In his blog post, Kahanna mentioned that Facebook may disable code that allows Marauders Map to work with Messenger. In fact, when I installed Kahanna's invention, I couldn't get it to work, so maybe it's already dead.
But the point remains. We're all sharing far too much data for our own good.
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