please elaborate your concern mate
do you want some script, which register a member on your forum with twitter/gmail/FB Login's?
if yes, we do have it for vB, IPB (not sure of rest tbh)

if something different, please mind explaing

EDIT:

if ur using IPB, tutorial link
Code: 
http://community.invisionpower.com/resources/documentation/index.html/_/tutorials/general-tutorials/twitter-connect-r349