SAN FRANCISCO — Facebook Chief Executive Mark Zuckerberg said its new features create “frictionless sharing.”

But they are causing friction with some users and consumer groups.

Facebook unveiled last week services that make it easier for its 800 million users to share more information about themselves and their lives online. The social networking service showed off a dramatic redesign of users’ profiles, a timeline that charts in chronological order all the information users have shared in the past. Facebook also said that third-party applications would — with users’ consent — automatically share every action users take, such as the songs they listen to or the videos they watch.

Privacy watchdogs are urging the Federal Trade Commission to look into the new features that they say push users to share more than they may feel comfortable sharing.

Marc Rotenberg, executive director of the watchdog group Electronic Privacy Information Center, which has criticized Facebook in the past, said he was sending a letter to the FTC pressing his organization’s concerns, which he says the agency has so far failed to address.

“It’s getting really difficult to evaluate the changes that Facebook makes, and I say that as a privacy professional. I can’t imagine what the typical user goes through,” Rotenberg said. “Users might opt in to what Facebook is planning to do, but Facebook never gives users that option. It just marches forward and users have to go along.”

Facebook did not respond to a request for comment. An agency spokeswoman declined to say if the FTC is investigating Facebook. The FTC does not discuss investigations unless the subject of an inquiry discloses the investigation, she said.

Privacy watchdogs aren’t the only ones who say Facebook is stripping away its users’ privacy. In a post on technology blog Mashable, Ben Parr said, “We’re at the point of no return.”

“Facebook’s passive sharing will change how we live our lives. More and more, the things we do in real life will end up as Facebook posts,” Parr wrote. “And while we may be consoled by the fact that most of this stuff is being posted just to our friends, it only takes one friend to share that information with his or her friends to start a viral chain.”

Facebook says it gives users the ability to control the privacy of their personal information. And it has taken recent steps to give users even greater control.

But it continues to be dogged by privacy concerns as it taps users’ information to better target advertising. Advertising sales make up most of the income for Facebook, which is preparing to go public next year.

With Internet companies gathering huge volumes of personal information, lawmakers and regulators in the U.S. and Europe have stepped up scrutiny.

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