Another site is the Social bookmarker http://www.socialmonkee.com. It generates 9000 backlinks from Social Bookmarking for your website or blog automatically every month. You can have a premium account to indicate 12 affiliates. Worth it. It allows a register by the day, as I have several sites took a while but worth it. Sorry by English, I'm brasiliam.
Hi. Social Marker is a site that directs you to over 400 pages of Social Bookmarking, it is not automatic but it helps you write because some items such as name, url, etc. and you list them all. Worth your time and to register at all.