As a part of updates to a 15-year-old American law the tech giants would face stiff fines if they do not follow the rules.
The Children's Online Privacy Protection Act (COPPA) was enacted in 1998.
According to Fox News, in 2011, the FTC beefed up the measure, preventing sites from collecting personal information from kids such as name, location and date of birth without a parent's consent.
This July, new amendments for kids under 13 will go into effect, approved by the FTC in December.
The rules are targeted at sites that market specifically to kids.
However, even a site like Facebook could be fined for allowing minors to post self-portraits, audio recordings of their voice, and images with geo-location data, the report said.
There are also new restrictions on tracking data, with cookies or a unique identifier that follow registrants from one site to another, it added.