Hi Mirandola,
Excellent idea and using the site builder this is very easy to do.
First, you need to know the URL to your social network profile you want to link to. Let's take Facebook as an example. Go to Facebook and click on "Profile" and then click on "Info". This shows your personal info on Facebook. At the very bottom it will say Facebook with a link right next to it. Copy that link.
Now, open up the GDI site builder and click on "Text". Notice that the box that opens has three options at the bottom: Design, Source and Preview.
Click on "Source."
This is where you enter in the code for a link.
<a href="THE LINK YOU COPIED FROM FACEBOOK">Visit my Facebook profile!</a>
Then click "OK." That will produce a link that looks like this:
Visit my Facebook profile!And you can do the same for any social profile link (or any link for that matter).
Hope this helps!
Vincent Parker