[JohnLBevan]

How to fix endorsements - rather than asking if someone has a skill, take two people in your circle claiming the same skill and ask who's more competent at that. Repeat this for all people in your circle with that skill and you can bubble sort people into who's best in your eyes. Next take those people's standing within their respective circles, perhaps weighted by some measure (e.g. people working in the same field's opinion counts more) and you start to get a good idea of how people compare to one another for the skills you're interested in. Even if those people don't have anyone in common you can use the 6 degrees of separation to use their connections' connections to approximate their standing compared to one another.

[JohnLBevan]

(of course, this assumes that you wish endorsements to have meaning; if you're just using it to increase user engagement with your site the current method works fine - until people get fed up with putting in redundant effort).