Remember the associate of that deposed dictator who needed your help transferring a few million dollars from a Swiss bank account? Well, he's back. And he—or one of his ilk—may show up soon posing as your "friend" on Facebook.

Someone bearing an eerie resemblance to those ubiquitous perpetrators of so-called Nigerian scams ended up in the online social network of Australian citizen Karina Wells. Earlier this month Wells received a message on Facebook from someone she thought was her real-life friend Adrian. He wrote that he was stranded in Lagos, Nigeria, had no access to a phone, and needed Wells to wire $500 for a plane ticket home. "Adrian" even pleaded for help in a real-time conversation over Facebook's chat service.

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