Facebook "like" button not working

After several months working without any problem, all of the sudden the “like” button on each article stopped working. When you click it, it “bounces back” meaning the page won’t allow anyone to “like” it.

At first it seems the button worked, but after a few seconds, it goes back to the original number of likes.

This is one particular example
http://blog.btrax.com/en/2011/05/21/top-100-most-valuable-global-brands/

I have not done any changes to the system or settings and do not even have what is causing the problem at all.

Has anyone experienced the same problem?