Your contribution cannot be approved yet, because it is in the wrong category. The correct category for your post is Suggestion.
The Sub-Project category is really only for very comprehensive "kickstarter"-like project concepts.
In the Suggestion category however, your contribution would make a really good example.
But I have to mention that the content discovery on steemit.com is a frequently discussed topic and there are already contributions related to this and contributions on Utopian shall always be unique. I think your contribution is unique enough, don't worry. Only for your information.... there even was a contest initiated by Utopian.
Please edit your post to use the right category at this link, as shown below:
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[utopian-moderator]
RE: Proposed system for user defined feeds