Hi,
Yes you need a way to put in the Unique id (facebook, linkedin, etc...) in you document. So you need to add some fields
To display the links/Icons you can use this code.
<%# IfEmpty(Eval("FaceBookID"), "", "<a target='_blank' href='https://www.facebook.com/" + Eval("FaceBookID") + "'><IMG src='facebook.jpg'></a>") %>
each different social Site has it's own way of showing public profiles.
Francois