Nielsen just released some surprising stats on Android app usage during a 30-day period. After analyzing the data, Nielsen has determined that Google apps dominate the top 10.

After the Android Market, which is an understandable first destination for smartphone users, the app most likely to be used over the course of 30 days was the ever-popular Facebook.

Some might think it’s a youth oriented application; however, according to the age brackets, Facebook seems the most universal over the age groups ranging from 18 to 44 with Gmail, Google Search, Google Maps and YouTube all close behind.

Simon Sage, writer for Into Mobile, said he could see Facebook partnering with the Android again in the future. “HTC partnered up with Facebook to create ‘the status’ not long ago and though it was an entry-level device that hadn’t garnered much interest among those interested…the concept wasn’t flawed in the slightest and I would be surprised if I didn’t see another Facebook-branded Android device again,” wrote Sage.

Facebook has obviously become a force to be reckoned with for any Internet company in terms of where users are spending their time online (including mobile). Facebook was also recently listed as the top free app of the year in the Apple Store.

Chris Crum, writer for WebProNews, said these new numbers give analysts a lot to work with regarding the application. “It really says something about Facebook’s power when it dominates Android use so much, even though Facebook’s Android app has been very buggy and often complained about,” said Crum.

Nielsen reported, “The sixth-ranked app spanning each age category was another Google property YouTube. The video hub does skew somewhat younger, with nearly two-thirds of 18-24 year-olds using the app compared to only 51 percent of those aged 35 to 44,” said Nielsen.

The last time Nielsen reported on Android app data was back in September. Those results spotlighted preferences on gender, where these results were more age-based. Those results in September also showed that more women (81 percent) versus men (67 percent) use Facebook. Women were also more likely to use Twitter.