Security problem

Hi,

on my blog http://www.matejmichalik.com/blog gets a strange message in red color in different languages on website.

The message in english is

“SECURITY WARNING: Please treat the URL above as you would your password and do not share it with anyone.”

I have found no solution to remove the annoying text but ppl is speculating on different forums that this security message is a result from a conflict between the plugin and a major security update from Facebook. Anyone have a solution how to fix this?

http://wordpress.org/extend/plugins/facebook/