My solution to this problem is simply that these websites shouldn't exist. A network of more than a thousand or so people can't reasonably give you any real sense of community. All these sites have a commonality: they are ad supported, so in order to end this the consumer ad industry must be collapsed, block ads and avoid purchasing products advertised to you. Once the ad industry is collapsed such sites will either be paid for or will be setup to facilitate a genuine need. This will maximise the benefits and avoid creating a constant stream of broadly irrelevant and useless information.