Recent books by respected authors like Malcolm Gladwell (“Outliers”), Susan Faludi (“The Terror Dream”) and Jane Jacobs (“Dark Age Ahead”) rely far more heavily on cherry-picked anecdotes — instead of broader-based evidence and assiduous analysis — than the books that first established their reputations. And online research enables scholars to power-search for nuggets of information that might support their theses, saving them the time of wading through stacks of material that might prove marginal but that might have also prompted them to reconsider or refine their original thinking.