OAuth authentication (facebook, twitter)
Plone has a openId authentication plugin.
I would like to see an OAuth authentication plugin to be able to log in with Facebook, Twitter and other OAuth providers.
The product that is listed below is over a year old. This should be something just built in. Not installed with an unsupported product.
Armin Stross-Radschinski commented
Take a look at tghis blogpost I remember and google yourself for more http://mrtopf.de/blog/data-portability/rpxforplone/