Social bookmarking websites play a big role in promoting your website /blog  and also can give you massive amount of traffic in a very short time  or then regularly.

They are many tactics to do  this and get noticed and jump right to the top  of these networks twiiter and digg. some do it the hard way  but there are many who do it the easy  but probably not very legitimate way.

Check out this article here  on how many people presently probably are reaching the top of digg or maybe  twitter so fast

Link  — > http://www.blackhatdomainer.com/how-to-create-a-black-hat-seo-botnet