(TinyURL.Com/RevTre = "reverse tree")
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The basic idea is the inverse of a "phone tree". Instead of one person generating content and relaying it through an ever-expanding tree of volunteers, lots of volunteers collect information and filter only the very best up to the next level, so the one person at the top gets the best of the best of contributions and doesn't have to waste time dealing with the majority of fan mail etc.
In addition to merely filtering submitted content, content can be improved as it rises from submission-leaves toward final-root, with feedback backward not just to say why submission rejected but to show how it was improved to make it more acceptable to pass further. In fact this mechanism can be used in education where less-expert students submit material and more-expert students repair it and tell less-expert student exactly what repair was performed, and thus less-expert students get coaching from more-expert students.
Examples of uses for this mechanism:

The trick to get people to work hard at pleasing the end-recipient / target (person or newsfeed etc.) by their efforts filtering stuff for that end-recipient to see, is to use a truth-futures market whereby people put a "price" on each item being filtered, that "price" being the probability that the end-recipient will like to read the item. The market "price" for an item, rather than any one individual's opinion, is used for placing the highest-value items in the target's BestInBox. The funds that can be earned for good estimates, or can be lost for bad estimates, are the incentive for good filtering on behalf of the target (person or newsfeed etc.).

IMO a reverse tree with a reward system for good work is the best way to accomplish a crowdsource-curated feed.

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These external links are to regular Web pages that are designed for full-screen Web browsers, not appropriate for viewing on cellphones:
tinyurl.com/f24sho indirects to Germany school shooting: thanks to Twitter, France 24 gets live account after 52 mins | The Observers
First detailed draft of reverse tree with myself as the target.

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