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They produce reports - often coinciding with the release of fresh company results - rating a share as a buy, sell or hold.
BBC: Q & A The role of the City analyst
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Teachers unions have been pushing to keep the evaluations private, an effort that accelerated after New York City released the results of a pilot teacher-rating system.
WSJ: Deal on Teachers Nears
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The firm's BrandIndex service surveyed two slices of the U.S. population, adults 18 to 34 and those over 35, to discover if their perception of the Facebook brand has grown more positive or negative over the past few weeks and rating the results on a scale of -100 to 100.
CNN: Amid backlash, Facebook tries to save face