Participatory Culture and Web as Told By Henry Jenkins

How is the phrase "Do It Yourself" a reflection of self expression?  You are not creating an idea yourself, instead you are simply following someone other person's ideas.  I disagree with Henry Jenkins on his belief that the phrase allows people to fall back into a void of self expression.

Just a side note, how can Henry Jenkins call himself a true scholar on female-centered science fiction in the 1990's?  From his picture he seems to be a male so how can he consider himself truly knowledgeable on such a topic when he could not have a true experience that only a female can have.  Going along with his whole idea of participatory culture, it seems that he may believe that he is an extremely knowledgeable source because of his academic work and the participation that he may have experienced from the presence of other females.  Maybe he gained some knowledge of the culture of female-centered science fiction through the participation of other females since he is so obviously male.

After reading his blog entry I still do not understand the difference between participatory web culture and Web 2.0  I'm hoping that this reading can be cleared up in class.