In 2012, the San Diego County Water Authority launched an unusual website to attack Southern California’s largest supplier of water, the Metropolitan Water District. The website, “MWD Facts,” featured information that was often superficially accurate — it usually came from Metropolitan’s own documents — but presented in a slanted or incomplete way. While it made a splash when it was first posted, the campaign never picked up much steam: Only 253 people followed the MWD Facts Twitter account, if that’s any indication of its popularity.