PR has done well in part because it is often cheaper than mass advertising campaigns. Its impact, in the form of favourable coverage in the media or online, can also be more easily measured. Moreover, PR firms are beginning to encroach on territory that used to be the domain of advertising firms, a sign of their increasing clout. They used chiefly to pitch story ideas to media outlets and try to get their clients mentioned in newspapers. Now they also dream up and orchestrate live events, web launches and t