Every once in awhile, though, you’ll run across some decent practical advice on LinkedIn. A post about avoiding frequent-flier miles scams—another one of LinkedIn’s top “influencer” posts of all time—has some unwittingly trenchant advice for aspiring thought leaders. “First,” author Christopher Elliott explains, “only a few people at the top of the scam benefit in any meaningful way. And second, many of those elite program apologists will do anything to defend the system that has rewarded them.” You don’t say.