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Europe’s GDPR privacy law is headed for red tape bonfire within ‘weeks’
(www.politico.eu)
This is a most excellent place for technology news and articles.
In theory you just need to have a way for people to contact you, like an email address. And then when you get an email you just need to handle their data according to the GDPR rules.
I have a website with user data and I'm perfectly GDPR compliant, just by having an email address available for contact and manually deleting their data if they ask for it.