Our first project, Mangrove, offers an alternative architecture for reviews and recommendations: we disentangle the data layer from the layer of value adding services, and thus enable reviews provided by people to be a commons, freely available to all.
See here our proposed standard for the open data set, and share with us what you think: https://gitlab.com/plantingspace/mangrove/blob/master/Mangrove_Review_Standard_v1.md
More about Mangrove: https://planting.space/mangrove.html
New York meetup: https://www.meetup.com/NYC_Ethereum/events/242192662/
Semi-technical Polkadot podcast: https://epicenter.tv/episode/199/
A good video explaining the basics of blockchain tech https://youtu.be/bBC-nXj3Ng4