WITH her coordinated zebra-striped scarf, tights and arm warmers (arm warmers?), spiky out-to-there hat and pierced tongue, 34-year-old Danah Boyd provides an electric Gen Y contrast to the staid gray lobby of Microsoft Research in Cambridge, Mass., which she enters in a flurry of animated conversation, Elmo-decorated iPhone in hand. In a juxtaposition that causes her no end of mischievous delight, her laptop bears a sticker of Snow White, whose outstretched arm gently cradled the Apple logo.

But Dr. Boyd — a senior researcher at Microsoft, an assistant professor at New York University and a fellow at the Berkman Center for Internet and Society at Harvard — is a widely respected figure in social media research. With a number of influential scholarly papers under her name, she travels relentlessly, tweets under the handle Zephoria and has fans trailing her at TED conferences, at South by Southwest and elsewhere on the high-tech speaking circuit.

She is also a kind of rock star emissary from the online and offline world of teenagers. The young subjects of her research become her friends on Facebook and subscribe to her Twitter feed.

“The single most important thing about Danah is that she’s the first anthropologist we’ve got who comes from the tribe she’s studying,” said Clay Shirky, a professor in the interactive telecommunications program at N.Y.U. and a fellow at the Berkman Center.