unique selling proposition (USP) is [...] a core element of a company's marketing strategy
Yet Hive is nothing like a company - it's more like an infrastructure. So if a road asked me about it's USP, I'd tell it to go and talk to the towns, cities, and other destinations that it connects.
Marketing on Hive needs to be done by Communities.
As an aside, I also believe that down voting should be only enabled for Communities. One community, one downvote. With communities free to decide how they cast their downvote. Unfortunately, in centralised Hive (Jongo's comment) that down voting problem probably can't be fixed.
But USP promoting can start immediately for Communities. Or even for Hive Groups, which is my term for an unofficial group of Hiveans collected around a tag.
Let's just market #liotes.
!BBH
P.S. I just spotted A great USP for Hive from @meno
RE: Why is Hive not growing?