This article on News.com describes how and why Google may be testing the waters with a new Social Networking site:Orkut.com
"Orkut is an online trusted community Web site designed for friends. The main goal of our service is to make the social life of yourself and your friends more active and stimulating," according to the Web site, which states that the service is "in affiliation with Google."
PS- Invitation is required for membership- if you're a member- invite me!