We’ve been getting a lot of questions along the lines of “Where do I find my Facebook App ID?” or “What’s a Facebook Secret?” Well, if we told you, it wouldn’t be a secret now, would it? Actually, you should keep your Facebook App Secret secret, but that doesn’t mean you’re not allowed to know what that they are.
In order to use the majority of Facebook’s tools, including the Facebook Registration Tool, you need to register yourself a Facebook App.
First, head on over to facebook.com/developers and connect to the Facebook Developer’s App. Once there, click “Set Up New App”.
You’ll need to name your App, then face-off with a Captcha before your App registration is complete.
Once completed, you have a nifty little settings screen, from which you can set some basic settings. The App ID and App Secret are under the “Web Site” section.
With this Facebook App ID, you can make various calls to Facebook’s OpenGraph and SDKs. The Facebook Application Secret is used to decode encrypted messages from Facebook (to protect private data from being stolen). However, the scripts (like the Facebook Registration Plugin for WordPress) making these calls have to originate from the specified “Site URL” or “Site Domain”. The “Site Domain” would be a necessary field if you’re running a multi-site blog, like WordPress.com.
The secret’s out!