Fixing Facebook IE problems
A friend of mine ran into this IE problem recently and it reminded me of one of the early snags I hit when developing a facebook application with the Open Graph API. IE is much more finicky about cross domain requests than other browsers, which can cause issues when authenticating with Facebook. The primary symptom of this problem is that a user can login to your site using the Facebook login button and firefox or chrome, but cannot log in via IE. The trick is that you need to also set the Base Domain field to handle multiple subdomains. So, if your Connect URL was http://www.somesite.com/, you’d set your Base Domain field to somesite.com.