I think that the people in Steemit are more positive for mainly 2 reasons.

• Unlike other social networks, in Steemit you are playing with money, people want to earn money and are kind to keep it, this does not mean that person is not really friendly, but tries not to be annoying at all so that nobody Mark it with a flag or something similar.

• People are happy, either because the money they earn here makes life easier for them in some aspects, or because they are aware of the bright future that Steemit and the entire cryptocurrency market can have, and how they are part of something that will change completely the world.

Usually people from poor countries feel quite happy for the money they earn, because even if they are only a couple of dollars, for them it is more than they would earn working in their country.

And people from more developed countries are usually more aware of what it represents, beyond just money, this whole cryptocurrency revolution.