Social Bookmarking Demographics
Very interesting post from E-Strategy.com: Social Bookmarking Demographics. This is extremely interesting and may find useful to see who is using the different types of bookmarking sites and what can be promoted to different audience groups.
In an article about social bookmarking in the Winter 07/08 issue of Search Marketing Standard, Joe Whyte cites Quantcast demographic data for some of the top bookmarking sites. This data is hard to come by, so it is valuable in helping to understand the respective services' audiences.