Hey Tomtensmage, welcome to DoF.
We are actively working on addition social features, and while as GPS replied it`s not in the game yet they will be in-time. In the next patch we are introducing friend lists, friend chat channels e.t.c
Trading with other players and friends is the next on our list.
And you can easily PvP with your friend, just ask him what region he`s in and how strong is his army or town is (strength indicator next to town/army name), and bring army of about the same strength to his region and start PvP (without Be Brave and Remote Scouting) and you`ll be fighting in seconds.
We do plan to add direct way to fight specific player both for PvP and Co-op in the near future as well.