@GaganBro : it is really strange.
How come .....
I also played the contest , one thing I observed it was redirected to MyGallaxy , where any user can answer the questions and can win.
I got the push notification for the same and played.
So one possibility is there, non community active user got the push message and participate in the contest and win. So in this case no post/comment/like can be ZERO.
If this is not the case then something is there .