Do I need an appId for a XFBML version of the Facebook Like button?
Answering my own question, after pulling out all my hair… http://developers.facebook.com/docs/guides/web/ “The JavaScript SDK requires that you register your website with Facebook to get an App ID (or appId). The appId is a unique identifier for your site that ensures that we have the right level of security in place between the user and your … Read more