In addition to Colorado and New York, the other states with attorneys general joining the suit are Arizona, California, Connecticut, Delaware, Georgia, Hawaii, Idaho, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maine, Maryland, Michigan, Minnesota, Missouri, Nebraska, New Jersey, North Carolina, North Dakota, Ohio, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Virginia, Washington, West Virginia and Wisconsin.
Nine state attorneys general in Florida, Massachusetts, Mississippi, New Hampshire, Oklahoma, Tennessee, Utah, Vermont and the District of Columbia have filed similar lawsuits in their states.
In all, 41 states and the District of Columbia have filed suit against Meta on the issue; another state, Arkansas, in March filed suit against Meta over the addictive nature of Facebook and Instagram.
Via USA Today:
https://www.usatoday.com/story/tech/2023/10/24/meta-states-lawsuit-facebook-instagram-children/71300954007/
Honestly kind of surprised California is on the list.