In game advertising is growing at a fast rate and the latest use is Mother’s day in game promotions. The promotions are added to the social games and then players can buy and visit the stores from within in there facebook and other social network games. Mother’s day has been a boost for this kind of advertising with revenues said to be $1 million dollars a day with flowers etc for Mother’s from in-game promotions.

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Social Game Publishers Hit Payday From Mother's Day Flower Offers

http://blogs.forbes.com/velocity/2010/02/23/eas-playfish-big-real-world-sales-in-virtual-goods-game/