An advertiser boycott is growing against Fox News after the New York Times documented a long series of sexual harassment allegations against the network’s star, Bill O’Reilly. CNN has the current count of advertisers pulling their ads at 20, but the number has grown throughout the day. The poignant response from the Twitterverse: the # hashtag, where victims share their 140 character stories. The boycott seems to be drawing a good deal of attention, but CNN’s Reliable Sources blog points out that advertiser boycotts are often short-lived, with sponsors returning after the outrage subsides. We will have to keep up the pressure.