Facebook has modified its privacy guidelines, eliminating a proposed controversial line about using teenagers’ content in adverts on the site.

Proposed in August 2013, the updated guidelines were aimed at relaxing policies on the use of names, profile photos and other information in online promotions.

At the time, the social networking firm said that teenagers would have to confirm that a parent or guardian had permitted to them to take part in such ads.

Facebook chief privacy officer Erin Egan said in a statement that the language was about getting a conversation started.

"We were not seeking and would not have gained any additional rights as a result of this addition," a spokesperson for the social networking site said.

"We received feedback, though, that the language was confusing and so we removed the sentence."

Facebook has reported a decline in its usage by young teen users, which was mainly affected by teen-focused, mobile-first social networks including Snapchat and Whatsapp.

The former was revealed last week to have turned down a $3bn take over offer from Facebook.

Last month, the social networking firm also relaxed its privacy settings for teenage users, who were earlier not allowed to post publicly.

An FTC spokesman said that the agency does not remark on probes or internal deliberations.

"The FTC rigorously monitors compliance with all of its orders, and that includes reviewing any material changes to the privacy policy of a company that is under a privacy order from the FTC," he added.