I apologize for coming dangerously close to blogposting here, but since I'm speculating/bouncing ideas off of a wall here, I can't think of a way to write this without it appearing so.
Would making an interoperable format(*) for user profiles and reviews be worthwhile (whatever that means)? I don't have a good grasp and what all it would contain (I'm just bouncing it off of you pathetic incels), but at the minimum it would contain the user's ratings and comments associated with certain links (and the links could relate to any product/service/website) or other profiles of the same format (which would allow the public at large to collect and 'weight' user ratings if they wished--I'll get into privacy concerns regarding this later). Every change to the profile would have some sort of cryptographic verification which would be used to identify different users in the format.
Obviously, currently existing social media platforms would not use it because they already have too much of an existing market share to want to use an interoperable and open format, but there would be two major players that might want to have such a format, as they'd be able to pull off of a larger network of previously existing customer data:
>Newer platforms: Bitchute, Voat, etc..
>Large retailers that are still heavily active in meatspace without as large collection of online customers as other online retailers: Walmart, Best Buy, etc..
Regarding privacy in the format, the biggest part of this would be the need of tags in this interoperable format to store zero-knowledge proofs that the profile was associated with a possible purchase or association to a product or service. That way no immediately identifiable information could be associated with the format, and users could make a new profile for each use if they so chose to maintain anonymity or pseudoanonmity if they wished.
(*) For those who want a better idea of what is meant by interoperability, the EFF has a series of articles about it: https://www.eff.org/deeplinks/2016/03/interoperability-and-w3c-defending-future-present , for example (tl;dr: think RSS, RSS is an interoperable format). The EFF's articles are reasons for wanting interoperable formats are pretty much the entire reason for suggestion this.
Pic unrelated.