This is a master list of websites where contributors have promoted their content in the past.  Results vary, but posting one link on a variety of websites, instead of concentrating on just one website, yields better results with Google and page views.
Make sure to abide by the website’s individual rules and guidelines before using it to promote your articles or links, however.
Social Networking/Microblogging
Facebook
Associated Content contributors may be interested in the Facebook widget created by Associated Content.  It automatically updates recently published articles to the person’s Facebook profile.
Myspace
Twitter
Social Bookmarking
DIGG
Delicious
StumbleUpon
Reddit
Blogging -
Blogger
WordPress.com
Livejournal
Vox
Xanga
Tumblr
Miscellaneous
Yahoo Answers
This …

Promoting your content is only part of the equation.  It is, however, a very fun and juicy part of the equation.  Promoting your articles on websites helps increase its exposure (exposure: how many people see the article), resulting in more clicks to your articles.  More clicks = bigger performance payments.
Posting your content on relevant websites without spamming can also increase the article’s rank on Google.  If your article is ranked on the first page on Google when typing in relevant keywords–say, typing in Twilight bookmarks if you’ve written an article …