As laid down in Article 16 GDPR, data subjects hold the right to have their personal data rectified (see the “Right to Rectification” subsection in the “Data Subjects’ Rights” section of the General part of these Guidelines). This is particularly relevant in the case of data gathered from social networks, since data subjects can provide false or inaccurate information due to a lack of understanding of the implications that it might have. Controllers are obliged to communicate the rectified data to each recipient to whom the personal data has been disclosed, unless this proves impossible or involves disproportionate effort. Controllers cannot argue that managing large datasets is too complex to ensure rectification in order to avoid this requirement.