Social Networking sites can be very effective in order to improve traffic to your website if quality time is spend on these sites.Few simple and good techniques are required to be adopted in SMM in order to utilize the full strength of the social networking sites.

Bookmark on social Bookmarking Sites:
Select the best sites of social bookmarking and bookmark good content in your websites.
Following are the list of good social bookmarking sites.
Backflip
BlinkBits
Blinklist
BlogMarks
BlueDot
De.lic.ious
Digg
Diigo
Facebook
Google Bookmarks
Magnolia
MyWeb Yahoo
Netscape
Netvouz
Newsvine
Popurls
Reddit
Simpy
Slashdot
Spurl
Squidoo
StumbleUpon
Technorati

Increase traffic utilizing your friends network:
One of the best methods for increasing the traffic to your site is to send messages to your friends as soon as a posting is made on the social networking site.This would increase your credibility on the site as lot of people would be aware of the content posted.

Create good profiles on the networking sites:
Few people are aware of the importance of creating good profiles in these sites.Profile pages get spidered by search engines and it is possible to have links to other profiles created on other networking sites.
Assume that you have a profile on MySpace, StumbleUpon, and LinkedIn, then you can link to:
* StumbleUpon and LinkedIn from MySpace
* MySpace and LinkedIn from StumbleUpon
* StumbleUpon and MySpace from LinkedIn

Also ensure that you add good keyword relevant content in your profiles,but not with the intention of spamming.Also as much as possible,upload your picture in these sites,as that usually invites more members.

Tag your content effectively:
The method in which usually people find you are through keywords/tags.So ensure that your article/content is tagged effectively

Impressive titles:
Good and Meaningful titles can easily catch the attention of the members.Ensure that it is done effectively.

Content is king:
Content ,which is based on interesting topics is one of the key factors in drawing the attention of the people.Focus on this immensely.

Build a huge community in the networking sites:
Make efforts to contact people,even if they might be strangers.Check out to see if they deal with the same industry as yours as this would be mutually benefical.

So hope you have a wonderful time in the networking sites and drive as much traffic !
The above tips are mentioned elaborately in the forum location forums.seo.com/showthread.php?t=408