Three days after Robert F. Kennedy Jr. posted on Twitter that he was still banned from Instagram, the Meta-owned social media platform announced that it has restored his account.

Utah’s regulations come amid ongoing debates about the impact of social media on young people’s mental health. Four other states are considering similar measures.

The activities of users of Twitter and other social media services were recorded and analysed as part of a major project funded by the US military, in a program that covers ground similar to Facebook’s controversial experiment into how to control emotions by manipulating news feeds.

The US military is developing software that will let it secretly manipulate social media sites by using fake online personas to influence internet conversations and spread pro-American propaganda.