@redgam8 quite a lot of potential winners (160 to be exact). They'll be messaging each winner individually, and the winner has to acknowledge. I believe once all the winners have acknowledged then they'll post the winners up. That's what most contests do before they post to the public. They have to make sure all the winners have been accounted, and in the event someonedoesn't acknowledge within the required time, then they'll pick a different name out of the hat.
I won a gift card last year for a contests and I was given a few days or a week to acknowledge.
