User blog comment:Asew54321/Candy Crush Saga Trivia Contest - Rules and Round 1/@comment-24247028-20140510044616

Recommendation: Ask the participants to do the questions on chat. This can prevent the answers of from being leaked to the late answerer, and discourage cheating since the precise answering time after the release of the questions can be accurately determined.

By posting the questions to the message wall, you cannot know one is busy or not (or attempts to cheat) if one answers late. Moreover, other people can see the answers after answering. This is certainly unfair.