Research shows that terrorists use the Internet to spread their propaganda, communicate, fund their organisations and attacks, train aspiring terrorists and plan and execute attacks off- and online. With the emergence of the metaverse – or Web3 – opportunities will unfold for terrorists online, and so will challenges to tackle these opportunities. Recruitment and attack planning possibilities will likely emerge and new targets might appear. A set of new laws, regulations and capabilities will therefore certainly be needed from stakeholders to ensure users’ safety and prevent the use of the Internet for terrorist purposes.