[W]hen Mitt Romney talked of cutting government money for public broadcasting in a presidential debate last fall and mentioned Big Bird, [Twitter] messages with that phrase surged. Human judges recognized instantly that “Big Bird,” in that context and at that moment, was mainly a political comment, not a reference to “Sesame Street,” and that politics-related messages should pop up when someone searched for “Big Bird.” People can understand such references more accurately and quickly than software can, and their judgments are fed immediately into Twitter’s search algorithm. . . . Other human
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