Together with Ronan Fathaigh and Frederik Zuiderveen Borgesius, Tom published a paper about the regulation of political microtargeting in Europe. The paper shows that political advertising, including political microtargeting, is protected by the right to freedom of expression. That right is not absolute, however. From a European human rights perspective, it is possible for lawmakers to limit the possibilities for political advertising. Indeed, some countries ban TV advertising for political parties during elections. The paper is open access, and available here.