What is the best social media website for obtaining traffic to a website?

I have been recently researching social bookmarking and social networking sites; the major players in this field are known to everybody, however my question is: According to your experience, what are the best social media websites in terms of attracting traffic to your website? What is good? What is a waste of time?

I would really appreciate your feedback, thank you in advance:

facebook.com
twitter.com
myspace.com
linkedin.com
stumbleupon.com
reddit.com
delicious.com
mixx.com
technorati.com
slashdot.org
netvibes.com
propeller.com
diigo.com
sphere.com
ping.fm
mister-wong.com

 

Without a doubt, digg. You can read for more details about it on:

http://www.elistmania.com/juice/10_things_that_make_digg_special_for_internet_marketers/

 

yeah checkout www[dot]webincreaser[dot]tk

 

I would say twitter comes first

 

Twitter and Facebook are the easiest. Digg also works very well but it is difficult to build up a reputation to promote your website compared to the aforementioned sites.

 

Thanks for your answers, so if twitter and facebook attract the highest traffic, followed by digg, what is next on your list? what about the rest of social media websites, has anyone tried them yet?

 

facebook is my vote. i use them frequently

 

I prefer Facebook,it is really the best social media website

 

So I noticed some success with Propeller, StumbleUpon and Mixx.com