As someone who happens to be good at finding people on the internet (true confessions), the approach I would have taken would have been related to FB likes, or

As someone who happens to be good at finding people on the internet (true confessions), the approach I would have taken would have been related to FB likes, or log-ins at the bar that they met on Facebook. I.e. they were all at the same bar in Austin, so search for people who have checked-in at the bar. And perhaps the other photo the engineers had was another location that she liked, or another piece of information about the bar in question. Then, it's just a matter of narrowing down results based on age and location. The fact that they knew the high school would have made this quest even easier. I once found an individual from a first name and the name of the bar they work at in (comically) downtown Austin. It took forever, but I had patience. :) The internet has all sorts of shortcuts to finding people if you know how to look!