Delete facebook session cookie from my application on users logout

Question

I am working in an application which is using facebook connect to log in the users using their facebook account.

Everything works fine except in the following case:<

Answer 1

I was having trouble with this too, and contrary to Efazati's answer, my trouble was with cookies set on my own domain by the Facebook php api library. The thing that I was overlooking was when deleting the cookie, using the exact domain and path that the cookie was set with. This is the line that successfully deleted the cookie for me.

setcookie("fbs_" . $app_id, '', time()-3600, "/", ".mydomain.com");

tgriesser's comment was also helpful.