Mary Meeker, partner with Kleiner Perkins Caufield Byers, unleashed her firm's annual Internet Trends report this week during the D10 Conference. Meeker said at the end of 2011 there were 1.1 billion mobile 3G subscribers worldwide, representing 18 percent of the total mobile subscriber base, and only 64 percent of U.S. mobile subscribers had 3G, including CDMA 1x EV-DO and Rev. A/B, WCDMA and HSPA. According to Meeker, while the mobile industry's reach continues to expand, content providers--such as Pandora and Zynga--are struggling to monetize their mobile offerings, with some finding that their ARPU is up to five times lower on the mobile than the desktop. Yet Meeker predicted mobile ARPU will surpass desktop ARPU over time. Regarding U.S. prospects for the future, there is "a lot to be excited about in tech, a lot to be worried about in other areas," Meeker said, noting U.S. gross government debt equaled 94 percent of GDP in 2010 and the United States' entitlement and interest expenses will exceed the nation's revenue within 15 years. See this article for more on Meeker's report.