RSS Graffiti, originally designed for Facebook page administrators, is useful for anyone dealing with multiple RSS feeds, especially those overseeing Facebook fan pages or multiple pages. The free app, developed by RSS Graffiti, checks user-specified RSS/Atom feeds and posts any new entries it finds to pre-selected Facebook walls. More than 353,000 people are using the app each month.

Well-established, easily recognized companies -- such as Microsoft and Twitter -- are behind some business apps. In other cases, smaller and newer enterprises like CircleUp and Huddle developed business-specific Facebook apps. In some instances, individuals looking to resolve a problem or rise to a technology challenge created apps, and then shared them on Facebook. No matter who did the coding, these business apps were designed to address issues such as group and individual calendaring; marketing campaigns; online collaboration; media feeds and analytics, and business networking. And, as Facebook continues toward its stated goal of 1 billion users, it's highly likely more business-friendly apps -- as well as productivity hogs -- will continue to arrive.

In August, Americans spent 685,000 hours on Facebook, accounting for 10% of overall time spent on the Internet in the United States, according to comScore. In fact, U.S. Internet users spent 22.7% of their time on social networking sites -- up 43% from the 15.8% they spent in 2009, according to an August 2010 study by The Nielsen Co. By comparison, users spent 8.3% of their online time reading and sending emails, the report found.

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