Google was the top-ranked Web property in February 2013, attracting some 228.1 million total unique visitors via desktop and mobile devices in the US, according to comScore's newly launched Media Metrix Multi-Platform service.

The inaugural report offers unduplicated accounting of audience size and demographics across the desktop (including video), smartphone, and tablet platforms, comScore said.

In addition to Google's desktop audience of 196.8 million unique visitors, the search giant attracted an incremental mobile-only audience—roughly 31.3 million users—that extended the reach of its desktop audience some 16% in February.

Yahoo was second with 210.6 million total visitors and an incremental mobile reach of 13%. Microsoft edged out Facebook for third place, attracting 175.9 million visitors and a mere 6% incremental mobile reach. Facebook attracted 174.8 million visitors and boasted a 20% incremental reach via mobile devices.

The following chart lists the top 25 in comScore’s top 50:

On average, properties ranked among the Top 100 increased their audience size 38% in February, and 19 of those properties had incremental mobile audiences that extended the reach of their desktop audiences some 50%.

The properties with the greatest incremental percentage gains via mobile were Groupon (223%), Zynga (211%), and Pandora (183%).

The following chart lists the brands ranked 26-50 in comScore’s top 50:

"We are excited to formally introduce Media Metrix Multi-Platform, a revolutionary development that combines comScore's flagship products to accurately account for unduplicated audiences across the desktop, smartphone and tablet platforms," said Jeff Hackett, executive vice president of comScore.

"This unified view of digital audiences not only establishes a new measurement standard for the industry, but also has the potential to unlock insights that can deliver substantial, currently unrealized value to our publisher, advertiser and agency clients."

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image of Lenna Garibian
Lenna Garibian is a MarketingProfs research writer and a marketing consultant in the tech industry, where she develops engaging content that builds thought leadership and revenue opportunities for clients. She's held marketing and research positions at eRPortal Software, GAP Inc., Stanford University, and the IMF. Reach Lenna via Twitter @LennaAnahid and LinkedIn.