Social Bookmarking is now a major building block for driving to traffic to your website. If done properly you can expect to use it as an easy and inexpensive method for natural search engine referred traffic to your site. You can use it to increase your revenues from Adsense and affiliate marketing. Social Bookmarking itself has many different approaches. You should however be careful not to exaggerate it and be considered a spammer. It can also result in your being banned from the site. The key is to follow proper ethics and uprightness when you socially bookmark your site.

Digg.com is, without doubt, one of the most popular social bookmarking sites. Searchers are known to surf Digg for hot and happening news. It allows visitors to vote for the news compiled on it, popularly known as digs. News appear on home pages on wards ranked by number of diggs. Such publicity will provide massive traffic to your site for free. It is no surprise that many Digg clones have surfaced and most of them are doing equally good.

Stumbleupon.com is another hugely successful social bookmarking site that uses a completely different approach. Once you install their toolbar to your web browser, you will be able to "stumble" through several different sites in a matter of a few minutes. You are sure to enjoy the surfing experience. If you are looking for marketing opportunities, you will gain by adding your own site to Stumbleupon's index so surfers will randomly reach your site. Voting system here, uses the term stumbles. More popular sites get repeated stumbles.

Twitter, is a recent phenomenon, and uses micro-blogging. You can submit a message not exceeding 150 words or tweets, but it is really useful, mainly because the updates are instant and sent to your friends via any cell phone or computer. You can send "tweets" to anybody anywhere which makes it such a great marketing tool.

These are not the only useful social bookmarking sites. There are many more and a few that deserve mention are - Technorati, Delicious, and Yahoo Buzz. The key to success lies in making sure that you submit your posts to as many social bookmarking sites as you can. It is a free and highly efficient approach for getting high number of visitors to your site.