For the past decade, “SpongeBob SquarePants” has been one of the highest rated children’s television programs. The show, which centers on a cheerful sea sponge who this in a pineapple on the ocean floor, has become popular with both adults and children, but that may not be a good thing. A new study out yesterday says that the cartoon has an immediate and detrimental impact on kids’ attention spans. Is SpongeBob really that bad for kids? Jeanne Sager, staff writer at CafeMom’s “The Stir,” says the answer is obvious.