Yeah buddypress corresponding group/s auto join and not only auto join
Depending upon the selection of certain field in the profile the user should auto join a group or some groups meant (not solely) for that option of the profile field.
Does a plugin exist which caters to this need? Or should this be converted to a feature request?
Seems I'v found a plugin at: http://wordpress.org/extend/plugins/auto-join-groups/
Will explore it and revert