Onarbor, https://onarbor.com https://onarbor.com, is trying to tackle the scaling issue you mention. Regarding the reviews and reputation building its very much

Onarbor, https://onarbor.com https://onarbor.com, is trying to tackle the scaling issue you mention. Regarding the reviews and reputation building its very much in the model of HN, Reddit, Stackoverflow. There is also a Kickstarter-like funding component. Worth a look.