Facebook is increasingly finding itself at the center of a tense discussion over privacy and how personal data is used by the Web sites that collect it, said James E. Katz, a professor of communications at Rutgers University.

Image Facebook asks users to link information in their profiles, which makes that information public. Credit... Screenshot courtesy of the Electronic Privacy Information Center

“It’s clear that we keep discovering new boundaries of privacy that are possible to push and just as quickly breached,” Mr. Katz said.

Social networking experts and analysts wonder whether Facebook is pushing the envelope in a way that could damage its reputation over time. The privacy mishap on Wednesday did not help matters.

“While this breach appears to be relatively small, it’s inopportunely timed,” said Augie Ray, an analyst with Forrester Research. “It threatens to undermine what Facebook hopes to achieve with its network over the next few years, because users have to ask whether it is a platform worthy of their trust.”

Over the last few months, Facebook has introduced changes that encourage users to make their photos and other information accessible to anyone on the Internet. Last month its chief executive, Mark Zuckerberg, unveiled plans to begin sharing users’ information with some outside Web sites, and Facebook began prompting users to link information in their profile pages, like their hobbies and hometowns, in a way that makes that information public.

That last change prompted the Electronic Privacy Information Center, an advocacy group, to file a complaint on Wednesday with the Federal Trade Commission.

“Facebook continues to manipulate the privacy settings of users and its own privacy policy so that it can take personal information provided by users for a limited purpose and make it widely available for commercial purposes,” Marc Rotenberg, the group’s executive director, said in a letter to the commission.