The question sounds as if it's a challenge. It should be more like "do you think you're capable of falling in love online?" But I get what you're asking. I don't think I'll ever FALL in love with someone online but I can have a crush on them. Not like idol-fan crush but the same crush you would have if you had met the person. You'll only be friends online but you'd feel that if you ever met them face to face, you would fall for them

Fall in love might be a little overboard for me but making friends online and turning into best friends is acceptable