I am not sure if you are aware that Steemit is built on top of Bitshares.
Bitshares is the DCO in this case, or originally they had launched intending to be a DAO.
I wrote this white paper on Decentralized Conglomerate Theory:
http://www.academia.edu/27773745/Decentralized_Conglomerate_White_Paper
Actually Steemit is built on top of Graphene, a modified version, not Bitshares 2.0 which also is built on top of Graphene but a different version. Steemit only has the Steem Dollar and a bunch of different features. In any case Steemit is a DCO but Steemit is not built on Bitshares.