I'm a big fan of LinkedIn, which is a social network for professionals. In fact, the service has helped me get sources for some of my stories.

But competition is starting to emerge, the latest comes from Hoover's, a part of Dun & Bradstreet (NYSE: DNB). Hoover's has acquired Visible Path, which develops an enetrprise-class social networking platform.

So what makes Hoover's Connect different? Essentially, it's a LinkedIn for individual companies and the system integrates with Microsoft (NASDAQ: MSFT)'s Outlook and other products.

Perhaps the biggest key, however, is privacy. After all, if you are a major executive (who has the power of the checkbook), do you want your contact information freely available?

Hoover's can also leverage its large base of business customers. For example, it is possible to use the system to develop referral paths for various companies, making it to make it easier to make a connection. Actually, according to a study from the University of Chicago and University of North Carolina business schools, it is 16 times more likely to get a response from a trusted source versus a cold call.

Tom Taulli is the author of various books, including The Complete M&A Handbook. He also operates DealProfiles.com.