Ask News.Yc: What is social bookmarking lacking today?

I know, i know...they are a tons of social bookmarking sites out now, but they all seem cluttered, slow, and confusing to me. Im trying to get a feel of what features poeple like, dislike or they would like to see implemented.

News.YC is sort of a bookmarking app (at least the way I use it).It works great for me because its fast, has a clean layout and it just so happens to deal with web pages I would typically bookmark. but the internet isnt all about startups and entrepreneurship.

Any input would be great. Thanks