At the end of 2004, I had just turned 21, and had been recently dumped by my high-school girlfriend. In between wallowing and distracting myself with endless commitments, I decided to try online dating. Back then, in the days before smartphones, access to the internet meant plugging one end of a blue cord into your computer and the other into the wall. From my desk, I created an account, adding a photo of myself in a pink halterneck dress. I added my search filters (inner-city Melbourne, aged 18 to 25, ticked "reading" as an interest) and dozens of profiles appeared. It seemed like magic: I told an algorithm what kind of partner I wanted, and the algorithm diligently introduced me to a range of people. Having grown up in the 1990s, it really did feel like living in the future. Within weeks, I had a new girlfriend: a PhD student who went to the same university as me. My friends said she looked like Missy Higgins, and I didn't see the resemblance but was plea...