If you like Font Awesome, you're going to love Black Tie!
             

fa-foursquare · Unicode: f180 · Created: v3.2 · Categories: Brand Icons

After you get up and running, you can place Font Awesome icons just about anywhere with the <i> tag:

fa-foursquare
<i class="fa fa-foursquare"></i> fa-foursquare

Looking for more? Check out the examples.