Mobile content usage spanning everything from downloading apps to browser and social network usage continues to escalate, but nothing is taking off quite like texting.

Nearly 75 percent of all U.S. mobile subscribers now send text messages, according to new data from analytics firm comScore.

The data, gathered from a monthly online survey of 30,000 mobile subscribers ages 13 and up, reflects an ongoing shift in the changing behaviors of the more than 234 million American mobile consumers. Mobile users continue to show an increased propensity to consume content, download apps, listen to music, and play games on their devices.

In December 2011, 74.3 percent of mobile consumers (an increase of 3.2 percent from September) used text messaging on their device, 47.6 percent (up 5.1 percent) used downloaded applications, and 4.6 percent more subscribers, or 47.5 percent of the total audience, used a mobile browser, according to comScore’s data.

Social networking is also on the up-and-up, though it’s still nowhere near as popular as texting. Thirty-five percent of mobile subscribers accessed social networking sites or blogs, an increase of 3.8 percent from September. So Facebook, which hasn’t figured out how to monetize mobile, may still have some time on its hands before the masses get acclimated to mobile social networking.

ComScore, which also looked at mobile software and hardware market share, found that Samsung still reins as the top mobile handset maker. With 25.3 percent market share, Samsung kept its hold over LG and Motorola, which both lost around half a percent of share. Apple, meanwhile, was up 2.2 percent in the OEM market and closed out December with 12.4 percent share.

On the software side of things, Google’s Android operating system nabbed an additional 2.5 percent of the smartphone platform market to maintain its number one position with 47.3 percent share. Apple too added 2.2 percent share and is still the strong number two with 29.6 percent of the smartphone platform market. RIM, Microsoft and Symbian, in contrast, all lost share.

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