User blog comment:Semanticdrifter/Understanding Privacy/@comment-5989773-20130829125250/@comment-5691231-20130829132124

Most large websites also collect a lot of personal information from their users.

That's why COPPA came into effect — the COPPA law is specifically set for ensuring personal information isn't shared from anyone under the age of thirteen. Which is why you have to be at least thirteen years of age to sign up.