New Jersey has joined a dozen other states filing lawsuits against TikTok due to concerns that the app is harmful to children.

The lawsuits stem from a national investigation into TikTok, which was launched in March 2022 by a bipartisan coalition of attorneys general from many states, including New York, California, Kentucky and New Jersey. All of the complaints were filed in state courts.

At the heart of each lawsuit is the TikTok algorithm, which powers what users see on the platform by populating the app’s main “For You” feed with content tailored to people’s interests. The lawsuits also emphasize design features that they say make children addicted to the platform, such as the ability to scroll endlessly through content, push notifications that come with built-in “buzzes” and face filters that create unattainable appearances for users.