There’s a lot of great stuff on Twitter. And there’s a lot more lousy stuff.

Sorting out the good from the lousy–or at least the OK from the spam–is an important task Twitter hasn’t figured out how to do on its own yet. So it’s getting some help from outsiders: The service is working with “realtime media” startup Sulia to provide curated Twitterstreams to apps and publishers including Flipboard, the Washington Post and Gannett.

Sulia’s pitch is that while Twitter is a free-for-all where anyone can say anything about anything, most people still want to pay attention to a handful of experts. The service says it can find those experts on thousands of topics, using a combination of algorithms and humans, and it assembles them into curated lists.