The wireless segment, which has been the primary source of growth through the industry, has been rapidly decelerating.

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The children's TV show "Sesame Street, " long a source of preschool learning, recently launched a new segment, "Elmo the Musical, " which infuses counting, calculations and shapes into singing, dancing and games.

WSJ: Top Math Resources for Preschoolers

Not only do games help Facebook keep a large segment of its population coming back, they are also an increasingly important source of revenue.

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