You can't possibly be in love with someone you don't know.

So, definitely, no.

Lust at first sight, sure, infatuation at first sight, sure. Love-if-you-have-a-weird-(IMO)-personal-definition-of-love, maybe too.

I have a picky definition. For example, I spent two years in a relationship with my first ex without being able to tell her I loved her, because I wasn't sure I did (we were great matches on paper and generally enjoyed the time spent together). Turned out, I didn't.

I loved my third ex. Hope to feel that again someday.

I know it's something that can be developed. In my case at least. I think everyone might be slightly different there -- to each their own. One thing is sure though, if you're using the same definition as I do, love "at first sight" isn't possible.