OpenLedger should copy MCXNow exactly. In MCXNow you couldn't post unlimited if you didn't have beyond a certain value threshold held at the exchange. Do exactly the same for OpenLedger.
Anyone who either pays a fee or buys some trollbox tokens should be able to send unlimited messages and access all the best features. Everyone else should get 5 posts per hour and no more. If you're a frequent chatter then you'll buy the trollbox tokens to have unlimited posts.
This would discourage spam and monetize the box. It would also be very easy to implement. You could label it "basic", "premium". Or you could label it "bronze", "silver", "gold", "platinum", or whatever you want. The more a person holds in terms of value on OpenLedger the higher their membership rank should scale, the more features they can access.
@JonnyBitcoin