At the request of dongibby I went ahead and threw together a little tutorial on blocking/ignoring someone that you don't want to interact with or see on the board.
Step 1: Select "Profile" from the Menu bar
Step 2: Select "Friends and Foes" from the Profile Menu (right below the Menu Bar)
Step 3: Scroll down to "Add a Foe"
Step 4: Type in the username of the person you want to ignore and press "ADD"
It's that simple. You can't add Admins or Mods though. Though break, I know.