It would have been easier if I knew their actual name. Or at least, something more unique than "You know, a person who lives in Finland, loves photography, rides bicycle, uses Mac laptop, and was alive a year ago". As in, I am certain their bicycle is pretty unique, but that's not making it any easier to contact them.

Apologies if I sound too stalkerish. Just last week, I corrected my coworker when they stated their birthday month incorrectly. They were amazed I knew their birthday. But they told me themselves, merely a year ago!