“Use of major search engines by users and the press:
“The unique audiences of Yahoo News and Google News now rival the online audiences of other current events and global news destinations such as CNN and BBC News”
Source: Nielsen/NetRatings
“Our testing has shown that press releases can create significant spikes in site traffic, and generate hundreds of even thousands of back links...”
Source: Marketing Experiments, "Research Brief (Press Release)"
“The cost per click of a PR [press release] campaign can be less than driving traffic through the purchase of keywords in a pay-per-click campaign.”