I want to add image icons for Facebook, Twitter etc with associated links and Join Us hyperlink like Join Us to the user registration email.
Can anyone give me idea?
There are a number of different templates for various emails sent out to users. By default, these emails are in plain text. You'll need a module (like HTML Mail) to enable sending HTML emails. Then, you should be able to edit any of the built-in user email templates to include images and links.