Social sites are very popular place where people collect and share content from anywhere on the web. Catch is if you find something interesting on the web there is a big chance that someone else using the bookmarking website will find it interesting, too. Use a tool called SocialMarker.com to submit to over 46 sites. Chose the group which is in your niche and post some content from your site or blog.
Social bookmarking websites are very popular with the major search engines, so if your blog posts can be found on these social bookmarking sites they will be notified by the search engines as well.
This is a social bookmarking service that allows you to submit your articles or blog posts to many social bookmarking websites at once When you create an account you'll simply need to enter the title of the post, a short description, the main keywords that describe your post (tags), and the category that it fits
StumbleUpon works on the same promise as OnlyWire with difference that there is also a community component so you can add friends to your account and let them see what you've been bookmarking. You can form networks of people with similar bookmarking interest, and vote on sites that have been bookmarked.
BlogCatalog is a social community for bloggers. It is a blog directory where you can search blogs, connect with bloggers, learn more about blogging, attract more blog readers, participate in groups and discussions, find the latest tools for your blog or promote your own blog.
Submitting your blog posts to Digg.com is a high and rapid way for quality traffic. You can create an account to submit your posts which are then interpreted and rated by it's users. By submitting quality and helpful items you can make popularity and be promoted to the front page. Another advantage of Digg is that all information is equivalent when it is submitted. Blogs only become ranked higher by the people who vote for them.