I believe Jetpack is using "Font Awesome" to display social icons.
This is the css
content: "\f203"; to display facebook for example. If I look in the site source I can't find anywhere the "Font Awesome" being downloaded.
How does this works?
The thing is that I just want to use those icons in my header without making the user download the font again. If I use
content: "\f203"; in my style.css the icon doesn't show.
I have Jetpack active and social icons are displayed on each post.