An addition to the coding of the code would be to add an additional field which would identify the source (possibly allocating the 5th category). Steem lends itself to be used by online newspapers if it had an additional feature which allowed them to constraint their display to information posted specifically on their site. Not only could they reward their readership ... it might be a way for them to reduce the cost of their writers. I mentioned in an earlier reply about adding a readership bonus.

A modification to steem might be to reward reading a maximum of 10 times per day (not just upvotes) ... to encourage readership ... While it might decrease the value of steem it opens the potential of the coin.

If the coin had a way that online media companies could brand their own content but still attract the entire steem network readership, I could foresee that they would advertise in regular media to come to their branded site.