There are two types of tokens — UOS and UOS.Futures. UOS to register your Importance and UOS.Futures to exchange to the mainnet UOS tokens. An additional pool of mainnet UOS tokens will also be distributed to all accounts per their Importance.
You can read the rationale and detailed description in the U°OS Network GitHub repository.
This is what the DevExchange community showcases. And you can start your own communities too.