http://lh5.ggpht.com/_w4mKSxw7YTo/SykiWqwtInI/AAAAAAAAAaI/9kPfPoPjMoU/hijacking%20script.png
This is one of the many types of spamming/hijacking scripts that I've seen as a moderator. If you are unwise to follow the instructions given by the spammer, the consequences are:
1. You will be instantly logged out and your orkut password chaged. Your account will be lost and can NEVER be recovered if you don't have second e-mail etc. I'll show you the above person's profile.
http://lh4.ggpht.com/_w4mKSxw7YTo/SyktEdbJKJI/AAAAAAAAAaM/C4Bm3xMPb70/s912/hacked%20account.png
2. The script will use your identity to spam your friends, the communities you are in and it will also change your profile about me to the above shown text.
3. This actions can cause your friends to accidently fall as vicims too.
HINDSIGHT: Don't ever follow instruction like this if you come across in orkut.