Date: 20th November, 2009
We were including the '=' sign in the cookie value which although works on many servers, is not actually valid accoring to RFC2965. The correct way to include the '=' character is by having the cookie value be quoted.
The result is that you will need to update your server side logic for parsing the Cookie to handle the quotes if needed.
Options for FB.login
Date: 25th November, 2009
We changed the signature for FB.login. It now takes a dictionary of options instead of just a permissions string. This will allow us to maintain backwards compatibility in the future if we expand the arguments.
XFBML and Advanced Data layer
Date: 18th December, 2009