just se http://seoandsemexpert.wordpress.com/2009/01/10/list-of-top-social-bookmarking-sites/ here is 700+ do follow social bookmarking sites ..
Good point. There are many lists of scuttle and pligg sites floating around the internet and I have been analyzing many of them. Scuttle and pligg sites have very short lives, it seems. When I try to add the live sites from the free lists (many sites are dead on free lists) to my Bookmarking Demon, a good portion of those live sites just don't work out at Bookmarking Demon for one reason or another. One common reason is that the bookmarking site owner is tired of being spammed and has added the kind of captcha that Bookmarking Demon cannot utilize, such as 'what is 2 + 5?' Or the site was once open to the public and now is a private site. In the private sites, some are available but you have to send an email first asking to be let into the private network. Other webmasters have simply removed the registration.php page from the site. These free lists can help those who submit by hand, because the extra captchas or sending off of an email to subscribe to a private network is just one more step. But for those of us seeking to save time through automation, free lists end up being only 20% useful. I saw many people here at Digital Point asking to buy verified lists of scuttle and pligg sites that work with Bookmarking Demon, so I decided to try to fill that need. I started up a service last month of selling tested lists of registration urls that really work inside of Bookmarking Demon. I just put up list 4 yesterday. You can take a look at the website in my signature. I give free replacement urls for sites that die within two weeks after buying one of my lists. That's a short guarantee, I know, but these bookmarking sites come and go like the wind. Many don't make it past a month. Whether you submit by hand or with Bookmarking Demon - Happy Bookmarking, the more bookmarks the better for your site!