I have a forum which requires people to login to see or post anything. One thing that I'd like to be able to do is to share posts on Facebook and have the Facebook debugger be able to scrape the topic title and eventually images that might exist in that topic. This works if the forum is public but as it stands, requiring login, the debugger will always scrape the login page of the forum (as expected).
Is there any way to allow Facebook to scrape the information that's needed (ie, allow the Facebook debugger to skip the login requirement). Is this even secure?