These days, it seems everyone and his mother has a Facebook page. In the U.S., about 100 million unique visitors flock to the social network every month. Many business owners are among them, using Facebook profiles to promote their companies and create customer communities. For some entrepreneurs, social networks have also become a useful advertising platform. Ellie Sawits, CEO of Frutels, a New York City–based maker of chocolate candies used to treat acne, says ads on Facebook are an affordable alternative to the high pay-per-click rates for acne-related keywords on Google’s AdWords. “For me, the economics of Google just don’t work,” she says. But it’s not easy to make your ad stand out among the Facebook status updates, party photos, and comments. Here are four tips to help you get started.