Social Networking sites can be much more than fun distractions and a way to keep track of your friends. Used correctly they can be very powerful List building tools. Websites like Twitter, Stumbleupon, Hubpages, Squidoo and Facebook are excellent tools for networking with and marketing to others in your niche. They are also great ways to drive traffic to your websites. If you want to build a niche list they are an invaluable resource.

The Micro-blogging site Twitter is a free social networking and micro-blogging service that allows users to follow one another through posts of 140 characters or less. It is a great place for posting small bits of information and for directing people to blogs or squeeze pages.

Stumbleupon is a social bookmarking site that works from a tool bar downloaded to your browser. It allows users to discover and rate web pages and ultimately functions to give social validity to some sites over others.