Many MMO schemes recommend using automated mass submission of page URLs as one of the ways to build backlinks (and short bursts of traffic). I think the idea is that some of the people who like what they see will put a link to it somewhere.
However, my understanding of most of the Social Bookmarking sites is that most of your chance for fame comes between the time you submit to the time you disappear off the front page. This is why some people recommend timing submissions to appear when your target audience is at its busiest.
I've just done an experiment with a medical/health information site I am building. I submitted two run-of-the-mill pages to every site on the list at an automated submitter site two days ago, and my host stats app (AWstats) shows no visits from any Social Bookmarking site and no increase in traffic to either of the pages. Today, I submitted by hand to StumbleUpon - at a period when the US was asleep - a page which contained advice on how to determine whether the person who just stumbled and fell in front of you at a party had actually had a stroke, and that if you called a doctor quickly they would probably recover completely. Ten hours later, AWstats showed three visits from StumbleUpon and triple the traffic I would have expected without the Social Bookmark.
Should I wait longer before making a judgement, or am I right in saying that it's a waste of time submitting mundane pages (however good they are) to Social Bookmarking sites?