Insightful post, as always!
LinkedIn endorsements now also seems to have “endorsed for x by y *who is very skilled at this*”, but that is probably based on how many people endorsed y for the same skills.
Do you think websites like stack overflow and Quora have a similar “problem” in determining the top influencer on metrics like reputation or is that a different problem space?
In addition to employer feedback, employers should also give weightage to the skills they need when posting jobs as well. At the moment, it seems to be all job title based or a whole bunch of keywords all added to make the job more exciting than it usually is :)