I think you can find people that you're pretty sure you would really click with in person. But I think it's more thinking 'I could really like them, I could fancy them, or I could love them, if we ever got to know each other in person.'. than actually loving them at that time.
Of course not every single person is genuinely themselves online, so you can never be too sure if it's reeeeeeally them. And I don't think you can ever fully know someone without knowing them in perosn, so I think there's a chance that you fill in the gaps that you don't know yet with what you'd like to be true. Maybe that means you can think more of that person than you would if you'd actually met them? And of course, people's bad points are a lot more easily hidden online.
But this is starting to sound negative.... I think you can find people that click with you and that you would definitely at least 'give a chance' if you were in person. It's certainly a lot more reliable as an introduction to each other's personalities than meeting in a bar while drunk.