Children will be able to have Linkedin accounts after the site dropped its minimum age from 18 to 13.
Profiles on children's accounts will have default settings which will make less of their personal information visible, while support requests from minors will also be dealt with separately.
Dr Bernie Hogan, of the Oxford Internet Institute, said the alteration, which kicks in on September 12, would help children to "differentiate between the public profile they want for employment and the personal profile they share on Facebook with their friends and family."
He added: "I am personally opposed to employers intruding on Facebook pages while screening candidates. The risk of unintended discrimination is very high."
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