http://www.trustedopinion.com/
Trusted Opinion is a local trust based social network. It tells you what friends of friends of friends, etc recommend, don't like, etc.
http://gmpg.org/xfn/
XFN (XHTML Friends Network) is a simple way to represent human relationships using hyperlinks. Recently, blogs and blogrolls have become the fastest growing area of the Web. XFN enables web authors to indicate their relationships using rel="me" etc.
