Drink responsibly. Flirt responsibly. The term "beer goggles" can mean nothing to you, if you take care in making a digital memory of the person you met last night — the person you thought was amazing at the time, but then got home and realized that you couldn't really remember his face.
Even if you're not drinking, your short-term memory could still be clouded by a heady initial meeting. Snap a shot for evidence that you weren't making things up. And there's no need to be awkward about it — ask them to pose for a picture with you, so you're not creepily just circling your iPhone near his face pretending to be checking a text message.