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Chastened by the $4 billion loss it inflicted on Apple shares in May, Engadget has started more rigorous factchecking. Of other blogs. Our sister site Gizmodo was taken in by a fraudulent tipster — a 16-year-old Australian with the same name as a Google product manager, which lent his email just enough credibility for a Gizmodo writer to run it. Editor Brian Lam, embarrassed, issued a complete retraction. Boy, do I know how that feels. Of course, Gizmodo's item ran on a Sunday, when it couldn't affect the public markets — and the minor Apple hardware updates promised in the faux tip were unlikely to move the stock, in any event. Memo to my Gizmodo colleagues: Next time you screw up, try to make it matter a bit more, will you?