To post a comment the first option you can select is "Optional: Sign in with Facebook" which opens a Facebook login window. Which is why most of those commente

To post a comment the first option you can select is "Optional: Sign in with Facebook" which opens a Facebook login window. Which is why most of those commenters had that [f] in their comments. So perhaps they thought they were somehow logging into Facebook but while they were really doing some kind of remote authentication.