Seattle-based Widgetbucks didn’t make the top 20, but it was called out in a new comScore tally of online ad networks.
Six months after its debut, the Mpire venture had 9.6 million unique visitors, reaching 5.1 percent of U.S. home, work and university Internet users in March, the report said.
The top three U.S. ad networks were AOL’s Platform A (with 170.5 million uniques reaching 90.7 percent of the audience), the Yahoo network (160.3 million, 85.3 percent) and Google (152 million, 80.9 percent).
So if Google bought Mpire, it would move into second place. …