The one who gets the most "likes"
Either alphabetical order or the one who is most active on EP. I get a lot of tie votes because I'm very active and have been here a while
The denizens of EP
I think it's the person who answers first when the asker doesn't chose.
The poster makes that decision. But often they don't make any decision at all.
Oh sorry, i misunderstood. So then the most people who click "Like". So i would imagine if it was a multi-way tie, no one would get it.
They have a commitee of midgets hired to vote for Best Answer