The phrase "snap decisions" means making quick choices or judgments without taking a lot of time to think or analyze the situation thoroughly. Full definition
In the crazy world of online dating, people often make snap decisions based on very little information and a huge part of what helps them make that decision is the profile photo. (30datesblog.com)
Whether we like it or not we all make snap decisions about matches based just on their photo — here we look at some very good reasons to go beyond that initial snap judgement. (eharmony.co.uk)
We all make snap decisions based on these pictures, so no selfies with the toilet or bed in the background. (older-dating.co.uk)