You probably realize that you can use social networking websites to promote your website. Firstly, you need to create a profile on popular social networking websites such as MySpace or Facebook.
I recommend building personal relationships. Some people just try to post spam. Instead of just trying to increase your friend count and post a bunch of spammy links all over the place, I recommend you try to build a few good relationships. Make friends with interested people. Really talk to them. Send them the link to your site, tell them that you want to promote it and make it a success, and ask them to review it and give you suggestions.
If you treat the person like a friend, they will often return the favor. At the very least, they will probably check out your website. If you have built a friendship with them and they like your website, they may help you promote it by telling their friends about it. Otherwise, they can help by giving you tips.
Consider their advice. They can tell you the first impressions they have, which you can use to help make your website better for new visitors.
What do you think?