Starbucks Coffee now has 10 million Facebook fans, more than any U.S. food and drink company—including Coca-Cola. But should the Coffee King get too foamed up over its achievement, it should know it’s trailing Lady Gaga by 400,000 fans. (The ONOSYS fan page is lagging by, um, slightly more.)

According to research MediaPost.com research, clever online promotions led Starbucks’ fan base to grow from 1.7 million to 10 million in one year. With the bait of a buy one coffee, get a free baked good promo, it hooked 200,000 loyalists in a single week!

 We know what you’re thinking: “How do they really know those fans are buying from them and not just signing up?” Good question. And here’s the answer.

Online ordering software tracks every customer move on your Web site, and follows all your Internet marketing campaigns: every banner click, e-mail offer and traffic from your Facebook page. You know who visits, what they bought, how much they spent and to which promotion they responded. In an instant, it pinpoints which of your marketing programs work and which don’t.