Steem is not a mineable coin, there are no warehouses filled with computers mining steem. On the steem blockchain, there are witnesses, which are similar in a sense to supernodes - which oversee the creation of blocks and the witnesses have big awesome computer rigs, but it in no way comparable to coin mining. Its not even comparable to google or facebook, because the information is not stored on a centralized server. The witnesses oversee the creation of blocks and transactions on the blockchain, eliminating a HUGE waste of energy. I still like bitcoin, because it paved the way, but I see steem as a very intelligent evolution.