Although we might not know who users are, they could certainly be analyzed from their activity to know what is of interest to them. The only reason such analytics has not been devised for this platform, yet, is the lack of paying advertisers and a need of a method to target them. One such scheme is outlined in my comment below

https://steemit.com/busy/@novacadian/re-taskmaster4450-time-to-end-the-biggest-failed-experiment-on-the-steem-blockchain-20181214t170703080z