Facebook学习笔记----新手上路

http://developers.facebook.com/get_started.php

* Your API key: this key identifies your application to Facebook. You pass it with all your API calls.
* Your application secret: Facebook uses this key to authenticate the requests you make. As you can tell by its name, you should never share this key with anyone.

4 Enter a callback URL. This is the address where your application lives on your server, or the server where the application is being hosted.
5 Enter a canvas page URL. A canvas page is the address where your application lives on Facebook. When users access your application on Facebook, they're taken to your canvas page. It's a good idea to use your application name or something similar. It must be at least 7 characters long and include only letters, dashes and underscores.