Mark Traphagen has succinctly put one of the major elements that makes Google+ so different than other social networks. Basically it’s all about sharing your influence, and helping new people build their own influence.
Mark is answering the question of whether building influence can be “gamed”. That is to say can a small number, of highly influential people, persist their own position as a closed group. The answer given is that no because that small group of influential people would essentially die out if they attempted to hoard all their influence.
This leads these influences to share their influence by helping out new comers, and sharing their friends content freely. Read the post below to see Mark’s full explanation, and you’ll also find a lot of value in the comments.