It has been said in the past that the reason why super-heroes have side-kicker is so that they have someone to talk to, to express their thoughts, deductions and feelings.
However, with the advent of Spider-man, it would seem that a lot of Peter Parker's conversation takes place in thought balloons.
Is this true? Is he one of the first superheroes to hold exposition in thought balloons?
Or did Stan Lee also make Daredevil a wisecracking swashbuckler to get away from the need for thought balloons?
Who was the first hero to use thought balloons extensively?