Endorsements are a relatively new thing (at least on LinkedIn). There have been out there for people to prove the possession of particular skill that is verified by a third person. In the past, this was done by a letter of recommendation. Now, it is a button that says “ENDORSE”. One click it and you are done.
Yesterday, I gave my professor from school @elreiss a +Klout on “Pole Dancing”. Two weeks ago I endorsed @muiiio for “Chocolate”. And a week before that I verified @cipisec skill “Beer”. All these lads are Internet Marketing professionals. None of them is a recreational stripper, chocolate chef or a brewer. They are just guys with a sense of humor pinpointing an issue.