At the time, it seemed the best course of action, given Comcast's sterling reputation on the social-media service. But Comcast ignored him, pushing Harper, a 26-year-old digital-media strategist in Naples, Fla., to take extreme measures. He began a campaign of "flaming" Comcast with withering tweets. Eventually, he got Comcast's attention, and the issue was resolved. Leyl Master Black had quite a