Multiple FB apps on one domain?

Jay,
Only one Facebook application can be running on a site at a time. The Facebook Javascript library has to be initialized with a single App ID. If it's initialized twice, the 2nd one will 'win', and whatever app is using the first ID will fail.

I'm not sure what the other component is or does, but JFBConnect has great Page Tab and Canvas support, and now (with the just released v4.1.0) allows you to send app requests to all of your users, or your users to send app requests to their friends. The system relies on the FB Canvas area, and you'd need to have JFBConnect setup to control that.

As for 2 separate applications, there's no way to 'link' the 2. If someone were to authenticate through one app and give permissions to your site, then use the other app, they'd have to authenticate again.

Feel free to bounce ideas off us and ask anything you want. We'll gladly explain the best we can!

Thanks,
Alex

Jay,
It's a Facebook restriction that you can't have two FB applications running on a site at the same time. They only allow you to enter the AppId to initialize the Javascript once. Two times isn't possible. Additionally, when the "Login with Facebook" button is clicked, Facebook is 'told' which extension should handle the user after they've authenticated. It's not possible to have Facebook notify 2 extensions that authentication has occurred, so only one (JFBConnect or the Classifieds) would be able to log the user into Joomla, create their account, or update their profile. Not both.

With that said, if there's some very specific separation you're looking for, we may be able to help you pluck the best parts of JFBConnect and the Classifieds extension for your needs. Specifically, you mention Canvas apps.. if you need just the Canvas App views, which also include the new Friend Inviter and App Request system, of JFBConnect, but want the Classified component to manage authenticating users on the site and other social buttons (like, comments, etc), that's probably do-able. However, if you want them both simultaneously always working, that probably isn't.

Hope that helps,
Alex