Of course depends on the circumstances, so I've provided some situations below...
Met in person at a bar.
Met in person at a local event (convention, concert, etc).
Met online, not exchanged (clean) pics.
Met online, exchanged (clean) pics.
And any other situations you can think of.
Most Helpful Girl
We start judging a person within the first twenty-fifth of a second of meeting them. After one-tenth of a second, we come to a conclusion about the stranger's attractiveness, likeability, and trustworthiness. And after watching the person chat with someone of the opposite sex for 5 seconds, we determine how extroverted, conscientious, and intelligent they are.
I can't find the citation, but that's from a psych project I did (i.e. it's from studies, not my opinion). So, we make judgments very quickly. I don't know how that applies to people we meet online though, I can only speculate.0