There's no way a priori to determine whether I want content without looking at it. At best I can delegate this up to a moderator to look at it for me.
There are entire subcultures of people who make a game of trying to get people to see images they don't want to see. This has been happening since slashdot and goatse.
> There's no way a priori to determine whether I want content without looking at it
This is plain false. HN does it, for example.
> At best I can delegate this up to a moderator to look at it for me
It's an algorithm, not a moderator. Moderators are currently employed for two things: a) censorship, b) influencing opinions. Everything else algorithms do just fine.
It's just when your tastes diverge from what's forced on us as acceptable, you shouldn't let in the dark.