Real or Fake; How Reliable Are LinkedIn Professional Recommendations?

Are there certain people selling or trading LinkedIn’s professional recommendations or endorsements for their own self promotion on LinkedIn? If yes, then how can you actually determine whether a professional recommendation posted on someone’s profile on LinkedIn is actually genuine? Are there any issues which may be deemed questionable or unethical when coming to some recommendations posted on LinkedIn users’ profiles?
As it’s generally known, most [...]

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