I would like to suggest Radio's.
When its time for haven and hearth to advance in time a little.. the first thing to come should be radios.
It would be an excellent way to communicate with your surrounding allies or enimies. It would also work great for trades.
You would only be able to build a radio inside a building with whatever resources.
There would be radio frequencies 1-100 that you set manually.
Each one would represent a different channel.
Whichever channel you might be on a chat window would popup when someone selected to talk into the radio.. like when recieving a message in the game saying Radio(frequency):(message.)
It would eliminate having to use forums and other communications for things such as trade because the community could dedicate a radio frequency to trade. also one to emergency.
So many things could come from this one simple thing.
I think it would be fun to frequency surf and listen to conversations.
You would also know what the fuck is going on in the world?
Your thoughts?