How to filter posts by value, upvotes or poster reputation ?

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I want to see only Steemit posts that have above some level of value, upvotes or reputation.
I thought that this is the main value of Steem in addition to it being decentralized.
How can I do that ?
Are there any plans to do that ?
How does it protect readers from spam ?

How to filter posts by value, upvotes or poster reputation ? | Ecency