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 website. The following example shows how to load the JavaScript SDK once you have your appId:”

http://developers.facebook.com/setup/

The title of that page/form is Create an App. I still don’t understand why they don’t use more generic terminology. I’m not “creating an app” and I don’t consider my website to be an app.

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