Facebook knows a lot about each of its users, of course, and it offers you options to make your account as private as possible. But that doesn't stop advertisers from drawing data from the social network, and using it to target you with ads.

Last week, a new company, Likester, launched "Likester AdCenter," a tool that analyzes the vast trove of data that Facebook generates from people hitting the "Like" button—750 million likes and counting. Here's how founder Kevin McCarthy says it works:

You can put any company into the Likester search engine, and learn a tremendous amount about that company’s fans, including what books they read, TV shows they watch, movies they watch, and other companies that they like, and so on.

We gave McCarthy a sample list of interesting companies—Walmart, Lululemon, Starbucks, etc.—and asked him to show us what the Likester database reveals about you when you "like" any of those brands.

The results are both surprising and depressing. Who knew that Stride Gum and Lynyrd Skynyrd were so popular among shoppers? On the other hand, all the stereotypes about fans of Harley Davidson and Pabst Blue Ribbon seem to be true—they like Larry the Cable Guy and The Melvins, respectively.

And you won't believe the ugly truth about Yankees and Red Sox fans ...