Facebook login never shows that it's loading

[vbinetruy]

When Facebook is used for login (after the first login of a user) the pop-up window saying that something is loading doesn't show up (while it does for twitter and google login).

After clicking on the Facebook login button, nothing happens for 5 seconds and then you get logged-in. The problem with it is that after half a second after pressing the button, if nothing happens, the user either keeps on click on the button (which restarts the loading process and makes it much longer) or the user quits MASAS.