Any unique identifier assigned to an "identifiable" person is PII. It doesn't matter if it is an IRC or Instagram handler, or a twitter username. It is PII if i

Any unique identifier assigned to an "identifiable" person is PII. It doesn't matter if it is an IRC or Instagram handler, or a twitter username. It is PII if it can be associated to a person. Euro/GDPR: https://gdpr-info.eu/art-4-gdpr/ https://gdpr-info.eu/art-4-gdpr/ ‘personal data’ means any information relating to an identified or identifiable natural person (‘data subject’); an identifiable natural person is one who can be identified, directly or indirectly. The keyword here is indirectly. Australia: https://www.legislation.gov.au/Details/C2019C00025 https://www.legislation.gov.au/Details/C2019C00025 personal information means information or an opinion about an identified individual, or an individual who is reasonably identifiable. (a) whether the information or opinion is true or not; and (b) whether the information or opinion is recorded in a material form or not. The keyword here "reasonably identifiable".