“We started with roughly 70 daily newspapers, and now we have 225. Currently the network embodies more than 50 percent of United States daily circulation,” said Spencer Spinnell, head of advertising strategy for Google Print Ads. “With this enhanced publisher network we now believe that we're ready and we've just released the user interface, the platform, to hundreds of thousands of U.S. advertisers who already have an AdWords account.”

Separately, Yahoo! also announced yesterday it has increased its ad sales partnership with U.S. newspaper publishers to 17 chains covering 400 newspapers. This is up from 176 publications when the Yahoo! program began in November.