Pedophiles have long used the Internet, but unlike the forums and file-transfer services that cater to people who have interest in illicit content, Instagram doesn’t merely host these activities. Its algorithms promote them. Instagram connects pedophiles and guides them to content sellers via recommendation systems that excel at linking those who share niche interests, the Journal and the academic researchers found.

Though out of sight for most on the platform, the sexualized accounts on Instagram are brazen about their interest. The researchers found that Instagram enabled people to search explicit hashtags such as #pedowhore and #preteensex and connected them to accounts that used the terms to advertise child-sex material for sale. Such accounts often claim to be run by the children themselves and use overtly sexual handles incorporating words such as “little slut for you.”

Instagram accounts offering to sell illicit sex material generally don’t publish it openly, instead posting “menus” of content. Certain accounts invite buyers to commission specific acts. Some menus include prices for videos of children harming themselves and “imagery of the minor performing sexual acts with animals,” researchers at the Stanford Internet Observatory found. At the right price, children are available for in-person “meet ups.”