home page small icons

My website is growing and now it’s the time to think about the small icons we can see in the home page.

Well, the is the “feed RSS” icon and the “admin” too, but I would like to have in that place even others, like “Facebook”, “Twitter”, “YouTube” and so on.
So, the question is: do you know how to do? Because, I don’t understand how.

Than you,
Luca