So I was at a attraction and met a very adorable HB9 working there.
Chatted with her for the whole ride (all of four minutes) very nice conversation and and at the end she says something about wanting to talk again. But tough to know because her job is to be polite etc.
In the distraction getting off she had to do stuff and tons of people started moving and I couldn't get her number or facebook, but I did catch her first name off her tag.

Anyway, I thought I could always go on again another day, but instead I Googled and easily found her on LinkedIn. Added her and later she confirmed me as a contact, so now I have her email or can message!

I thought it might be stalkerish to contact this way, but I'd also just facebook friended another cutie I'd met and only had a first name. FB search with a first name and some details like her college and major and it's easy.
I think it's very plausible and congruent to explain (if you have to) that if you have her first name + details she already told you in person, and she pops up near the top in a search, then it's not stalking.

I've got what I think is a good joke lined up just in case it comes up: "I just put in your name + college/whatever she told you + beautiful/gorgeous/whatever and your face was right there!"

So I've really got to get better at #closing but made a couple of saves this way.