The findings have implications beyond blogging, according to Pew, because bloggers are “much more likely to engage in other content-creating activities than nonblogging teens.”

Image LAUREN RENNER, 16 On Agirlsworld.com, blogged about her daily life and worked on the sites My first prom magic story that lets girls fill in blanks and make a tale about themselves. Credit... Natasha Calzatti for The New York Times

But even though girls surpass boys as Web content creators, the imbalance among adults in the computer industry remains. Women hold about 27 percent of jobs in computer and mathematical occupations, according to the Bureau of Labor Statistics.

In American high schools, girls comprised fewer than 15 percent of students who took the AP computer science exam in 2006, and there was a 70 percent decline in the number of incoming undergraduate women choosing to major in computer science from 2000 to 2005, according to the National Center for Women & Information Technology.

Scholars who study computer science say there are several reasons for the dearth of women: introductory courses are often uninspiring; it is difficult to shake existing stereotypes about men excelling in the sciences; and there are few female role models. It is possible that the girls who produce glitters today will develop an interest in the rigorous science behind computing, but some scholars are reluctant to draw that conclusion.

“We can hope that this translates, but so far the gap has remained,” said Jane Margolis, an author of “Unlocking the Clubhouse: Women in Computing” (MIT Press, 2002). While pleased that girls are mastering programs like Paint Shop Pro, Ms. Margolis emphasized the profound distinction between using existing software and a desire to invent new technology.

Teasing out why girls are prolific Web content creators usually leads to speculation and generalization. Although girls have outperformed boys in reading and writing for years, according to the National Center for Education Statistics, this does not automatically translate into a collective yen to blog or sign up for a MySpace page. Rather, some scholars argue, girls are the dominant online content creators because both sexes are influenced by cultural expectations.