Why Facebook and Google Have to Worry About Mobile

There’s plenty of reason to look at all 112 of Kleiner Perkins partner Mary Meeker’s latest slides. And the title of her presentation is appropriately broad: “Internet Trends.”

But there’s one trend in particular worth breaking out about what Meeker calls the good and bad news in mobile web usage.

On the one hand, payments companies invested in mobile technology should be glad to see mobile web usage growing as a percentage of all internet sessions. By her research, Meeker estimates that 10 percent of all web sessions were conducted using mobile devices, up from just one percent at the end of 2009.

But for mobile companies hoping to generate revenues from advertising — think Facebook and Google — there’s a downside as well. According to Meeker’s estimates, advertisers are paying five times more to reach consumers on desktops than on their mobile devices.

As previously stated, the entire presentation is chock full of great data. For example, even with smartphone subscriptions nearing the one billion mark, significant upside remains, considering there are more than six million total mobile subscriptions worldwide. And the growing popularity of the tablet device continues, as nearly a third of all American adults own one.

The entire presentation is available at TechCrunch.