Despite its comprehensive scope and application, the General
Data Protection Regulation (GDPR) does not cover absolutely every
personal data processing activity in the European Economic Area. As
a matter of common sense, the legislation specifically excludes
from its scope ‘any purely personal or household activity and
thus with no connection to a professional or commercial
activity’.
In practice, this means it is fine to maintain lists of contact
details of friends or use social media to send your family festive
greetings without first presenting them with a GDPR-compliant
privacy notice (which thankfully avoids the need to find a lawful
basis for sticking their faces on dancing elves).