On 3 March 2017 the French journalist Judith Duportail asked Tinder for the personal data it held on her, using her right under EU law. About 800 pages came back.
They held her Facebook likes, her education, the age range of men she was interested in, and when and where every conversation with a match took place. They also held Instagram pictures, deleted ones included.
It didn't come easily. Paul-Olivier Dehaye, a data protection campaigner who helped her, said it took "real involvement of one data protection activist (me) and a human rights lawyer for them to answer".
What it shows
A dating app keeps a running diary of your love life: who you looked at, who you talked to, when and from where. Most people first see that diary when they ask for it, and some only get it when they push.
For your own record
Ask the apps you use, and the ones you've left, what they hold. Note the date you asked. If the answer is slow or partial, the dated request is what you, or a regulator, can hold them to.
We wrote about what dating apps keep, and where it goes, in What dating apps keep, and how the way you write can name you.