I've developed a basic dApp http://cryptospeech.com
You can also read about how it works at http://cryptospeech.com/how-it-works.html
. To post and view messages you'll need your browser configured to connect to the Ethereum blockchain with something like MetaMask. There are also both Mainnet and Testnet versions of the site, so if you change MetaMask to the main or test networks it'll load that version.