We knew that Facebook was growing fast. We also knew that it wasn't just for college kids anymore. But recent numbers show that Facebook's audience is growing older, quickly. The group of Facebook users over 35 years old is booming. In the last 60 days alone, that demographic of users has nearly doubled, according to Inside Facebook, an independent Facebook watchdog.

Also according to the analysis, there are more Facebook users in the 26-44 bracket than the 18-25 sector. That's important to note, as the older segment has considerably more buying power in the U.S. economy. It also appears that most new Facebook users are female.

The fastest growing segment of Facebook users remains women over the age of 55.