We have recently started to include buttons for social bookmarking services such as delicious, digg etc. in our posts.
For those who wonder: Here are two nice and simple explanation of how to do that:
Now my question: Those of you who have some experience with this, which of the many available services did you find most useful, i.e. which gave you the most traffic? I'm asking in particular because the posts linked above are fairly dated so I dont know whether these are all still major players or whether something essential is missing. Also, I'd prefer to have as little buttons as possible - which do you think make sense?
Of course, this will depend to some extent on the specific content. In our case, its reggae / dub / dubstep music.
Thanks in advance!