Because of the popularity of Digg, Del.icio.us, Netscape and all the other social sites out there, social bookmarking buttons have been taken to a whole new level. Instead of bloggers placing a few buttons at the bottom of each blog post, it seems that many enjoy offering their visitors all possible options.
It may seem like a good idea at first, but your ever so curious visitors will end up clicking on random buttons which will take them to sites that they are not familiar with and then they will not bookmark your content. Even your most tech savvy readers don't have accounts at most of these social sites, so why drive them to sites where they will not bookmark your content.
So if you want to leverage the popular social sites on the web, don't add tons of social bookmarking buttons on the bottom of each of your blog posts. Instead select the popular ones such as Digg, Del.icio.us, Newvine and Netscape or select the ones that have audiences that are most likely to bookmark or submit stories related to the topic you usually write on.