Social Bookmarking sites seems to be springing up in abundance. Apart from the obvious of having your favourite websites URL's available when you are away from your computer what other use are they?
The answer is probably not much! Unless, you are a webmaster and have content that people are interested in and looking for. If you are lucky enough to hit the front page of one of these sites you can expect to see a good short term increase in traffic to your site. The traffic boost will most likely be short lived, normally a couple of days at best.
You may also get a residual effect of a slight increase in traffic and the possibility of some more back-links to your site.
Our article on CSS opacity got picked up by a few users at StubleUpon with 4 reviews being written. The result of this was around 6,500 additional unique visitors over a period of 3 days and some backlinks. There has also be residual traffic increase ever since.
I am not suggesting that you go out hard submitting your sites to all of the Social Bookmaking networks. But the occasional bookmark of a well written, relevant article won't go astray.
This just goes to show that the content is the most important part of your website. So, next time you write an article or blog post make sure that you write it for your intended audience and not the search engines.