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Facebook traffic dropped nearly 10 percent in September, according to a sneak peak at ComScore's latest stats given to GigaOm. That's a significant drop to a chart that's been climbing steadily all year, and especially odd during the start of a new school year when traffic traditionally soars for student sites. My Valleywag coworkers say that can't be right — it's a huge failure of ComScore's measurement methods that the company will have trouble explaining. Then again, I'm reminded of the anecdotal tale of the scientists who decided there must be a bug in their software because it showed — ha ha! — a gaping hole in the ozone layer.