Its a very interesting use case of the blockchain
That says it all.
It has a community of reputable great minds and is the gateway for even mainstreamers to the blockchain world. Apart from that, capacity-wise, it is the best in the world and there is no doubt. Speed, feeless, secure, scalable and easy to use without downloading blockchains, from your browser and phone. Too, apps can be built on it and with smts next years, existing websites and external communities can integrate steem.