But a five star rating system that aggregates the opinions of my friends and colleagues (i.e. people whose tastes tend to be positively correlated with my own)
You don't befriend people who have different tastes or opinions than you? Most of my friends don't even like the same food as each other. Some use mac, some use Windows, some use Linux. How sure are you that those ratings would be more useful than those of the general population?
Also, didn't facebook try this out at one point? Facebook would seem to me to be a perfect platform for this type of service.
The main reason I have (at least some) confidence in my friends' ratings being more useful than those of the general population is that the system approximates what my friends and I currently tend to do, which is go to restaurants recommended to us by our friends.
We've got tastes and opinions in spades, but when it comes to picking a restaurant, we're really not that different - our different opinions are discussed over a dining experience we all want to try and/or enjoy.
If we didn't have a tendency to like the same dining experiences, we probably wouldn't be eating together in the first place. The 'smart/group average' example also seems to be a good way of avoiding or minimising that kind of clash if you don't already know the person.
Most of my friends don't even like the same food as each other.
I'm intrigued by this. I can't think of any particular foods that my friends would say they don't like or don't eat - except perhaps obviously unhealthy options with no redeeming features (eg most fast food). I suppose some people might have a very specific pet hate for something, but usually that results in that person not ordering that thing rather than the whole group going elsewhere.
Australia has quite a multicultural society with a rich variety of cuisines, so that may be part of the explanation. Upon reflection, I'm not confident that our approach would always be accepted by friends not from here.
Maybe this is all just an example of the hyperlocal being more useful to an individual than the general. If Facebook implemented it well, and didn't co-opt each of my ratings into some kind of advertised endorsement, perhaps it could work there too.
You don't befriend people who have different tastes or opinions than you? Most of my friends don't even like the same food as each other. Some use mac, some use Windows, some use Linux. How sure are you that those ratings would be more useful than those of the general population?
Also, didn't facebook try this out at one point? Facebook would seem to me to be a perfect platform for this type of service.