Seattle-based Mpire, the operator of widget advertising service Widgetbucks, said today that it has launched a new product called AdXpose. According to the firm, the new, invite-only beta service allows brand marketers and interactive agencies ability to verify where their ads are running across the Internet. The firm said the new product provides real-time tracking of campaign placement, reach, and consumer engagement of ads--through exchanges, ad networks, and direct buys. The service is targeted at helping marketers make sure their advertising is going where they are intended.