Do fall in love at first sight or does it take time. For me, it takes time for me. I like her then it comes.
Takes a bit of time for me, personally. I've only ever crushed on good friends, but that could be because I value personality compatibility over looks.
I usually can tell immediately. It's weird but I'm living with someone I've been in love with at first sight. I have a good sense of people mind set and intentions before I meet them.