Thanks, Andy!
The Simple Facebook Connect plugin is supposed to allow website members to sign in to Facebook to comment on articles, but it doesn’t seem to work with the Mingle Theme.
Not sure if this is a Mingle-problem or a BuddyPress-problem.
Do you know of another way to allow website visitors to comment on articles via signing into Facebook (instead of filling out name, email and URL fields in the comments section of posts)?