Edit: Apparently not, as this information is only publicly available since this September. Zeitgeist at work?
It's an idea from sci-fi - I can't remember who wrote what, but there was a society where citizens got more or fewer votes depending on their behaviour (edit: Alastair Reynolds? Banks? Feels like it was one of them.), and knew each other's scores, and Tom Disch's 334 is explicitly about scoring people, and one segment is dedicated to "Baz" desperately trying to get his score up by producing a piece of state-loving prose, before narrowly failing and being consigned to life as a faceless "g[ue|o]rilla" soldier - although in that the state scored you, not other people.
[update]
https://en.wikipedia.org/wiki/Whuffie
I was thinking later, Cory Doctorow: https://en.wikipedia.org/wiki/Down_and_Out_in_the_Magic_King...
+1 upvote, would cautionary tale again.
PS - If you haven't read Rapture of the Nerds, check it out. It's a Doctorow character (downer of a dude) in a Stross world (craaazy tech).
Brooker claimed he was spooked by this coincidence.
But other aspects tangential to the rating system portrayed in the episode are already very much of interest to technology companies as potential future undertakings, with far-reaching consequences. Whether such undertakings have actually been green-lighted as live projects with lots of momentum, is unknown to the public at this time.
On December 29, 2015, Facebook has acquired a patent [1] "that would allow creditors to assess your creditworthiness based on the credit ratings of the people in your social network."
Facebook applied for the patent in 2012 as part of a bundle of
patents it purchased from now-defunct social networking site
Friendster. The patent was first noticed by SmartUpLegal. This is
how the patent describes the invention:
When an individual applies for a loan, the lender examines the
credit ratings of members of the individual’s social network who
are connected to the individual through authorized nodes. If the
average credit rating of these members is at least a minimum
credit score, the lender continues to process the loan
application. Otherwise, the loan application is rejected.
[1] Unites States Patent No. 9,224,213http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=H...
[2] Facebook’s new patent lets lenders reject a loan based on your friends’ credit scores—but don’t freak out
http://qz.com/472751/facebooks-new-patent-lets-lenders-rejec...
Edit: I don't buy on ebay however rating brigading has made reviews/ratings on amazon practically useless for products I've never used before.
For Yelp, I've found that a 4+ star restaurant with >100 reviews is almost always good, although I wouldn't say that I can detect a difference between 4-star and 5-star places.