The data processing in both electoral and political advertising (in particular microtargeting advertising) context shall comply with data protection principles under Article 5 of Convention 108+. These personal data must be processed in compliance with purpose limitation and data minimisation principles. In particular, according to Recommendation CM/Rec(2012)4 of the Committee of Ministers on the protection of human rights with regard to social networking services, social networks should secure the informed consent of their users before their personal data is shared with other categories of people or companies or used in ways other than those necessary for the specified purposes for which they were originally collected. In order to ensure users’ valid consent, they should be able to “opt in” to a wider access to their personal data by third parties (e.g. when third party applications are operated on the social network). Equally, users should also be able to withdraw their consent.