I've placed a Facebook "like box" on my site and everything worked fine until recently, when it was automatically replaced by a green "sign in" button with the text: "Find us on Facebook. Create an account or Log In to see what your friends like". The button leads to the following url: http://www.facebook.com/campaign/landing.php?campaign_id=137675572948107&partner_id&placement=likebox_plugin&extra_2=MK
I have no restrictions based on country or age, everyone is allowed to become a fan on my FB page, so I don't see why the visitors would have to sign in? It also ruins the look of my site url here. How to solve this problem? I found other people who have the same problem, but no solution.
In case you don't see the problem, here's a url to a screenshot.
Additional details: The problem doesn't appear if I'm signed in to FB. I would like the "like box" to appear as it was before, for all visitors, regardless if they are signed-in to FB or not (some dont have a FB account at all, but they could still see the like box, my logo, the like button and the number of fans in the box).
The html code for the widget can be found here: http://developers.facebook.com/docs/reference/plugins/like-box/
I copied the iframe version of the code.
I'm afraid that maybe FB modified the widget in some way or its just a temporary error? I would really hate if they are intentionaly displaying content that I don't want on my site and forcing the visitors to log-in. I suspect that this may be some sort of advertisement, like attracting people to sign up (note the word "campaign").
Thanks for your opinions.