Dr. Joanna Dolgoff, a Roslyn pediatrician, uses Twitter to give...

Dr. Joanna Dolgoff, a Roslyn pediatrician, uses Twitter to give nutritional tips and answers questions on how to live healthier. Credit: Photo by Handout

When the 36-year-old Roslyn pediatrician started her “Red Light, Green Light, Eat Right!” program three years ago to combat childhood obesity, she didn’t have the funds for old-school advertising, but immediately found Twitter to be an effective marketing tool. She tweets nutritional tips and answers questions on how to live healthier.

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