# Of the 20 million minors who actively used Facebook in the past year, 7.5 million - or more than one-third - were younger than 13 and not supposed to be able to use the site. | # Of the 20 million minors who actively used Facebook in the past year, 7.5 million - or more than one-third - were younger than 13 and not supposed to be able to use the site. |