Sitecore CMS 6.6
Social Connected 1.2
There are 3 configuration that is not documented in the Sitecore Social Connected document. Without this, you'll get blocking error.
1. Do not tick the "Do not show the first page" of the Social Account creation wizard. On the Social Connected 1.2, without this page, the wizard will not work, and you will be presented with blank wizard page. The workaround is to request hotfix from sitecore. Hopefully it's fixed in version 1.3.
2. There is changes to Facebook Apps creation setting. By default, new apps have the option of "Sandbox Mode". Disable this option. If you enable this option, only the registered developer will be able to use Facebook API. That means, your internet users will not be able to login to Facebook via your apps.
3. Your site must not be running on certain port number. From the reflector, the Social Connected wizard is constructing the return url back to your site without the port number. Which means, the return from Facebook will not reach your correct site.