No idea if anyone is using this, but it does what it says, spots fake online reviews and adjusts the star reviews accordingly. It doesn’t give info on individual reviews, and concentrates on big sites like Amazon and Tripadvisor. Respect to the developers for doing it, I can almost hear the seals and gaskets popping if they started to analyse eBay. 
Give it a try with an Amazon link.
https://www.fakespot.com/

Give it a try with an Amazon link.
https://www.fakespot.com/