I've added a friend, why aren't they showing up in Tomahawk?

There is a known issue that sometimes you won't see your new friends until one of you restart Tomahawk.  

If that doesn't work, make sure one of you is visible externally (from your local network), so you can connect to each other. To achieve that, you got two options:
  1. Enable UPnP in Tomahawk and your router. (This is the easy way)
  2. Setup a manual TCP port forward on your router, and tell Tomahawk about it in the "Advanced" setting menu, under "Static Host Name".

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