A wide range of jQuery plugin which help us to create Facebook style designs are follows:
I got this huge collection from this website. I am just rewriting that post here.
1) Facybox
Website here
2) Facebox
3) FCBKComplete
Go to webstie
4) Facebook style registration
Go to website
5) Gmail/Facebook style jQuery chat
Go to website
6) Facebook style comment using jQuery
Go to website
7) Facebook style auto complete
Go to website
8) Facebook style picture edit
Go to website