I took some notes on social networking on the blockchain about a year ago during the big Reddit upheaval surrounding sub banning, the voat migration, et cetera. I see blockchain based social media as an eventuality for a subgroup of the population. The Akasha website[1] is unfortunately very short on details.

I'm not convinced quadratic voting is a solution at all. If user account creation has a fixed cost then there is always a number of upvotes for which it's more cost effective to create alts and upvote en mass.

The real solution is moderation as a form of patronage. There's a demand for moderation in all social media, the supply however is limited in Reddit's case by a volunteer-only force and other systems by salarying an in house staff. Fee based moderation by subscription turns into a signal selection mechanism.

If advertising isn't the signal you want to select for, subscribe to moderation feeds that block those accounts/posts. If you want to block racis(m/ts) subscribe to moderation feeds that block that content. Aggregate and remix moderation feeds at will and let a market develop.

[1] - http://akasha.world/