As implemented, they&#x27;re basically useless.  Asking &quot;does X know about Y?&quot; without verifying that I have any knowledge of Y myself doesn&#x27;t do much.  My dentist has endorsed me for things like &quot;Cloud&quot;, and while he&#x27;s a great guy and good at his job he can barely work his iPad.<p>I personally view those as noise at best and very skeptically at worst -- if someone has a bunch of endorsements for a particular skill I suspect they actually don&#x27;t know much about it.