A new service - http://myfeatures.org
is offering us to know what other people think about is - were they friends, colleagues, etc.
I think most people are sometimes nudged by the question - "what do they think about me, am I cool or boring?". But of course few people are going to tell you that you are "boring, irritating" or "awesome".
A school game introduces the concept of anonymous evaluation - every student writes a good and a bad features of each class