Flickr is an online photo community where photographers can store, organise and share their photos and videos. Users upload media to their own accounts and share it publicly or with selected people, and the service is delivered as a website and through apps. It is a proprietary service, not open source, and no self-hosted version was identified.
Flickr is operated by Flickr, Inc. in San Francisco, which the terms state is owned by SmugMug, Inc., a California company. Both are US entities, and the terms are governed by California law. The privacy policy says data is processed on servers operated by Flickr or its service providers in the United States or other countries, without naming them, and does not say whether EU users' data stays in the EU. For EU transfers it relies on Standard Contractual Clauses and the EU-US Data Privacy Framework. A European organisation should weigh this against US jurisdiction and the absence of any stated European hosting option.