However, Facebook authorizes those applications. If I have correctly understood the two articles I read in the anglophone and francophone press, when people signed up for Facebook, there were various security standards that were respected. However, as time goes by, the security measures are less and less stringently applied. Facebook is the one that allows games like FarmVille and others on its site. Some laws will be broken and privacy will no longer be respected.
On October 19th, 2010. See this statement in context.