I see these under posts, looked all over, don't see that they do.  Thanks,

   Dave

Hi , Dave
It's just like Reble's description .  It expresses your opinion briefly .

Good, thanks, Patrick & Rebel.  Reminds me of "Like" on Facebook, when you agree, but it's not worth writing a reply.  

dking3 Posted at 2015-12-16 01:10
Good, thanks, Patrick & Rebel.  Reminds me of "Like" on Facebook, when you agree, but it's not worth ...

Dave - thanks for asking this question. I assumed from using other forums that an upvote was to indicate that the  contributor to the thread answered the question, or gave more worthwhile insight.