At present there are over 3.3 billion pages indexed by Google, and that definitely does not cover the entire Internet. With so many competitors around, you sure have to use every conceivable method available to promote your website.
Newsgroups can be very powerful tools in your web promotion endeavor if you use them actively.
What is a Newsgroup?
A newsgroup is a message board on the Internet where users come to discuss topics of mutual interest. Each newsgroup is dedicated to a particular subject of interest and consists of messages posted by participants. You can find several ongoing discussions surrounding various topics within a single newsgroup. These topics are call threads. As a user you can start a thread, post messages to a thread and make responds to other postings.
Before the Internet era, the way you know it now, back in eighties and early nineties people used to connect to electronic bulletin boards (bbs) through modems and post text messages for others to read and answer. Usenet Newsgroups was started as a collection of these bulletin boards. Along with the Internet, Newsgroups have also started to grow rapidly. Thanks to the Interface introduced by Deja News in 1995 use of Newsgroups became simple and convenient, which also gave enough impetus to this growth.
Today, Usenet discussion forums or Newsgroups indexed by Google comprise over 800 million messages, which is around a terabyte of information! It is calculated that over 10 million people have regular access to Newsgroups!