Yaron Eisenstein got in contact and asked me to have a look at 8minut.es. The service is a Digg-like crowdsourced news / attention service. One of the key difference is the ticking clock where content gets pushed away if no one shares it in 8 minut.es which means that it keeps things cleaner as spamming would require a sustained effort. It also means that in some ways is more of a compete against Twitter as a zeitgest temperature taker.
One thing that is missing is a method of citation like a link to a trusted source, it relies on people’s inner BS meter which is fallible.
UPDATE: Actually, every post does have a link section in the share action. – Yaron Eisenstein