Well, nothing really comes to the top of my head when I think "game message". All I can think of is those messages you send on online games. I'm not sure how you develop a site around that.
Though it may not worth much now but hang on to it. It may be worth alot later. The gaming/entertainment industry evolves very fast and who knows if in the future games based on messages will catch on.
Just recently I read an article whereby a designer / clothing manufacturer incorporated a game online whereby the pieces of clues can be found on the clothing that are sold in the shops.