Create a QR code to point people to your Facebook fan page. This will allow you to get likes from people who access your website, ad, or other promotion via their smart phones.
Here’s one for http://www.facebook.com/thejohnkremer:
About John Kremer
John Kremer is author of 1001 Ways to Market Your Books, the Relationships Matter Marketing program, and many other books and reports on book marketing, Internet marketing, social media, and book publicity. -- John Kremer on Book Marketing.