[dsaber]

I think that's a bit of a hyperbole. If I'm asked by someone for a recommendation, but I'm not comfortable recommending him/her, chances are I will simply ignore the request. If I do write a recommendation, it will most likely be on things the positive things I've seen about the person.

Assuming people in general approach recommendations in the same way, LinkedIn recommendations are good at identifying strengths of a person, but not weaknesses. In that aspect, they're not total junk.

Obviously, I wouldn't base hiring decisions on LinkedIn recommendations, just like I won't base such decisions on letter references, but they can be a small factor that influences the overall decision (after an on-site interview for example).