b GDPR, which permits the processing of data for the fulfilment of a contract or for pre-contractual actions.</p> 4. Social media Twitter plug-in <p>We have integrated functions of the social media platform Twitter into our website. These functions are provided by Twitter Inc., 1355 Market Street, Suite 900, San Francisco, CA 94103, USA. While you use Twitter and the “Re-Tweet” function, websites you visit are linked to your Twitter account and disclosed to other users.