Maybe, there's a lot more you can tell about a person from just looking at them than you might realize, so there may be something to it. (eg. body gestures, personality traits like shyness and confidence etc.)
NO u dont love at the first sigth. u are attracted to, infatuated to, or u lust for the person, highest is u like the loks of that person and the love comes wen you have spent some time with the person.