Free Search Engine Optimization (SEO)
Social media sites drive links; links drive rankings. Get familiar with Digg (digg.com), StumbleUpon (www.stumbleupon.com), Netscape (netscape.com) and Reddit (reddit.com), because these social-media sites can drive huge traffic. More importantly, that traffic leads to numerous inbound links, which are the rocket fuel powering your organic rankings.

digg              stumbleupon          reddit

Not all of your content is Digg-worthy, but see if a few times a year you can develop content so compelling that it warrants attention from the social-media tribes.