added to shared list automatically

added to shared list automatically

Hi
I ve created a contact database and embeded it on my blog. I want ppl who visit my blog to be able to create an account and fill info in my form. But since make my application public will send this data to search engine, i want to keep it private. But whenever any user signsup on my blog i want them to automatically be added to my shared list.

How can i do that/
agr.prashant