Buddypress Group Join on Signup

I love the idea of a person being able to sign up for a group when they join our site

http://wordpress.org/extend/plugins/auto-join-groups/

is such a plugin - but old and not 3.x supported.

Does anyone know a way to get such as:

Automatically join members to groups based on user profile fields.
Automatically join a member to a group based on a profile field. For example, say you have a profile field where the person selects his state from a drop down list. If he selects, New York, he'll be automatically added to the group New York