A settlement announced Wednesday between Meta and dozens of states resolves one of its most significant legal battles, yet the social media titan continues to face litigation elsewhere concerning the impact of its products on young people's mental well-being.

The settlement abruptly ended a landmark trial in federal court in Oakland, California, where the parent company of Instagram and Facebook had been defending itself against claims that it deliberately designed features to make children addicted.

The agreement requires Meta to pay up to $18 billion and to alter how its platforms operate, adding new safeguards for child safety.

This is one of many courtrooms across the country where Meta, TikTok, Snapchat, and YouTube have been defending themselves against claims that their platforms have negatively affected children's mental health or caused them other harm.

Here is an overview of the most significant legal challenges confronting social media companies.

The settlement was reached during the second week of what had been anticipated as a six-week trial in Oakland, where testimony from witnesses would likely have included Meta CEO Mark Zuckerberg.

The lawsuit, initiated three years ago, named four states—California, Colorado, Kentucky, and New Jersey—as plaintiffs, among dozens that sued Meta over its design features and the resulting harm to children on its platforms.

The remaining 25 states had expected trials later, but the settlement also prevents those proceedings from moving forward.

The states sought substantial financial damages that could, in theory, amount to billions of dollars, alongside demands for operational changes to how the company manages Facebook and Instagram.

The settlement also brought to a close a trial that had been in progress in Tennessee against Meta.

The Tennessee attorney general's office was involved in the multistate investigation into social media companies that led to the 2023 lawsuit against Meta by dozens of states, but it chose to file its own case in a local court.

"We took Meta to court because Instagram was harming children and misleading parents.

We are now ending the trial with a settlement that introduces unprecedented protections for kids and secures a record amount for Tennessee's Children's Digital Protection Fund," said Tennessee Attorney General Jonathan Skrmetti.

Skrmetti, along with several other attorneys general, asserted that the settlement acknowledged Meta’s role in an “industrywide problem” and urged other social platforms to adopt comparable safety measures.

New Mexico was not among the 48 states involved in the settlement, as it had already prevailed in a legal action against Meta.

The state argued that the company deliberately harmed children's mental health and hid what it knew about child sexual exploitation on its platforms.

A jury agreed with the state in March, finding thousands of violations, each counted separately toward a $375 million penalty.

In early August, the judge in the case ordered Meta to pay an additional $567 million to address harms to young people from its platforms in the second phase of the trial.

The judge also outlined new safety measures he ordered as a part of the ruling, including a time limit of 90 hours per month for users under 18, AI chatbot restrictions, and mandatory warnings on the platforms.

Meta has said it disagrees with the verdict.

The other state that declined to join the settlement was Florida, where the attorney general contended that the terms were insufficiently stringent in their treatment of Meta.

Hundreds of school districts across the United States have initiated legal proceedings against the major social media platforms, seeking damages to offset the costs they claim to have incurred in addressing the detrimental effects of social media addiction on children's mental health.

A lawsuit initiated by a small, rural school district in Kentucky was set to go to trial this summer in a federal court in California, but each of the defendants—Meta, TikTok, Snap, and YouTube—settled before the trial began.

The Kentucky case was likewise designated as a bellwether among 1,200 comparable cases.

The plaintiffs’ attorneys asserted in a statement that their “focus remains on pursuing justice for the remaining 1,200 school districts who have filed cases.”

Earlier this year, a jury found Meta and YouTube liable in a case centering on social media addiction, with allegations that the companies engineered their platforms to ensnare young users with scant regard for their well-being.

The plaintiff, identified in court by her initials KGM, testified that she developed an addiction to social media during childhood, which she claimed aggravated her pre-existing mental health difficulties.

Following deliberations that spanned more than 40 hours, a majority of the jurors concurred, awarding her $6 million in total damages.

This unprecedented lawsuit was randomly chosen as a bellwether trial, acting as a test case for both sides to assess their arguments before a jury, and could thereby influence the outcome of similar cases.

TikTok and Snapchat were named as defendants in the lawsuit, but reached a settlement prior to the commencement of the trial.

Meta and YouTube have each lodged an appeal against the verdict.

The Los Angeles trial was unprecedented in its nature, yet thousands of analogous lawsuits have been lodged against social media companies by individuals.

Many argue that the platforms' design features made young users addicted to social media, leading to negative mental health outcomes.

However, plaintiffs also claim that additional harms resulted from young people's use of these platforms.

Several lawsuits have been initiated by families of children and young adults who died by suicide following problematic social media use, as well as by families whose children died from accidental overdoses resulting from drug purchases facilitated through social platforms.