• by Mark Walsh  @markfwal, April 21, 2011

With publishers extending their presence across a growing array of devices, comScore Thursday rolled out a new audience measurement service providing total site traffic across mobile phones, apps, tablets and shared computers such as at Internet cafes. The comScore Media Metrix Total Universe report will be available to clients with the release of April data in the U.S. and U.K., with other markets to follow.

Publishers are required to add Unified Digital Measurement (UDM) tag to participate in the report which will feature standard metrics such as unique visitors, reach, and page views, unduplicated, across multiple media platforms. A comScore spokesperson said about 90% of the top 100 Web publishers are currently using the UDM tag. Unlike its monthly Media Metrix report ranking the top 50 online properties, comScore doesn't initially plan to publicly release the Total Universe rankings. Read more here.