Mobile measurement company M:Metrics has released its first ranking of the top mobile websites based on data collected via its new MeterDirect product, which monitors the usage habits of a pool of roughly 500 mobile phone users, reports AdWeek.

Not surprisingly, the most-accessed mobile websites mirror the most-visited venues: Google, Yahoo and MSN were the most-visited mobile websites in February; they were followed by Microsoft's Live.com and Disney's Go.com portal.

Though the top five list consists of familiar names, M:Metrics executives said they found surprising depth in mobile internet usage: 10,000 different sites recorded traffic during the month.

The average mobile web session lasts nearly 10 minutes, and the workday (8 a.m. to 5 p.m.) is the period of heaviest use, with Friday the most active day in the U.S.