While I'm not a fan of "hate speech" I don't like the idea of a central, for-profit company defining the boundary lines as that is a slippery slope as to what gets classified.
The continued rise in online speech being censored creates significant opportunities for 
...online companies are taking it upon themselves to stamp-out so-called “hate speech,” strangling free speech and the free exchange of ideas in the process.
A number of troubling actions by internet companies — Google most prominent among them — are making it increasingly clear that some in Silicon Valley have proclaimed themselves defenders of the progressive, politically correct faith, and that those firms will silence any and all heretics who challenge those beliefs.
http://www.lifezette.com/polizette/silicon-valley-tightens-its-grip-on-free-speech/
What are your thoughts on how the blockchain can best facilitate free speech while not supporting the hate?