Something similar happened to me after a long flight. I spent half the trip talking with a traveler who shared an Instagram page packed with lesser-known destinations and cheap travel ideas. I scribbled the username on a napkin, but it vanished somewhere between the airport and home. Later I found several accounts with almost the same name. What helped was checking public profile details through instagram private account viewer to narrow down the options. It was much faster than opening every profile one by one and trying to guess.