XFN™ (XHTML Friends Network) is a simple way to represent human relationships using hyperlinks. In recent years, blogs and blogrolls have become the fastest growing area of the Web. XFN enables web authors to indicate their relationship(s) to the people
Clickable article giving an overview of history, distinctions and definitions, potential uses, current manifestations, and permutations of this thing called (conveniently, but not accurately) 'Web 2.0.'