I vaguely remember there being some #SoftwareFreedom issue with #FontAwesome. Was it just the attribution requirement, which has now been canned? Everything else looks fine to me:
https://khan.github.io/Font-Awesome/license/
Kudos to creator #DaveGandy for coming to the party on this. Please consider giving him the attribution he asks for, even though you're not legally obliged to. It's really not much to ask.