For example, I’ve received 6 endorsements for PHP, but so far as I can tell, only two of the people who have endorsed me for this skill actually have experience working with me on some PHP-related project. Two of the six people I don’t even know.
Then, too, I can’t be the only one getting endorsements from people I don’t know, for skills they are in no position to judge. And if it is happening to others it means that to some degree, large or small, the endorsements you see in LinkedIn come from people who don’t know the person they are endorsing and have no way of judging that person’s ability at a given skill. So how could I trust the endorsements in the first place? Certainly some of the endorsements are genuine and reflect actual experience with the person and skill in question–but how do you know which and to what degree? You can’t.
It makes it seem like a big waste of time. Don’t get me wrong: I appreciate people taking the time to endorse a skill that I’ve listed on LinkedIn, but I take it more as someone trying to say something nice about me, as opposed to having any real value.