Update: Since writing this, Facebook has altered the look of the Application Settings page. Now there’s only two major settings that you need to set, and they’re both on the Web Site tab: The Site URL and the Site Domain. Set those correctly and your App will work with SFC. Set them incorrectly, and it will not. So, much simpler, really.
The majority of the email I get from users of the Simple Facebook Connect plugin is questions regarding how to setup their Facebook Application. It’s really not that hard to do, but the plethora of options can seem somewhat intimidating. So here’s the basics of what you need to do.
After creating your application, you’ll need to visit the Apps section in the Facebook Developer Home area. Here you’ll find your application, and the all critical “Edit Settings” link.
Firstly, never give out your Application Secret. If you give this out by accident, then use the Reset Secret Key link to get a new one.
Anyway, from here, you want to go into the settings. The settings area is divided into six main sections, but most of the settings are irrelevant. See, you’re building a “Connect” application, not a “Canvas” one. So most of these are meaningless for you. The following ones are what you actually care about:
Obviously, you want the name of your Application to make sense. I suggest using the same name as your website. You can even use your domain name here if you like. Just be aware that this name is what the Fans of your site will see in their Applications area.
The Basic Information section is important as well, fill it in as you see fit. I also recommend uploading good icons and/or logos for your site. Gives it that finished look.
Contact Information is obviously important as well, but don’t worry about all those extra URLs. They really apply more to Canvas apps. Of course, if you want to make special pages on your site for them and provide the URLs here, feel free.
The Authentication Settings page is surprisingly important. Those top two boxes need to be unchecked for a Facebook Connect application. Why? Because when they are unchecked, your Application becomes an “External Website” as far as Facebook is concerned. If you have either them checked, then your app’s Canvas section becomes active and you might have users trying to add it to their profiles and such, resulting in broken pages and a general bad user experience.
The Connect Settings page is probably the most important one. These settings must be filled in and they must be absolutely accurate. Specifically, the URLs must be the URLs that are actually used by your site. Capitalization matters. The leading “www” or lack of one matters. Whatever the URL your site is in the browser is what you MUST put into these fields. Anything less and your site will not work.
The Advanced Settings screen contains these three fields which you need to set in the same way I did. The email domain no longer exists, however. They removed that in favor of a different approach, so you can ignore that field.
Finally, after you have saved those settings, take the time to go back to the main application screen and click the “Edit Application Profile” link. You’ll be taken here, where you can set up the “look” of your application page on Facebook. This includes what tabs are visible, the stuff in the Info section, etc. You can add extra Applications tabs to this page and generally customize all sorts of stuff. None of that affects your site, but it does affect how the App Page looks in Facebook. The more polished it is, the more likely people will “Fan” your Application. And Fans get updates from when you publish posts to the Wall. Great way to drive traffic to your content.
Hope this helps! Mainly, I hope this reduces the number of questions I get about this process. Enjoy SFC!