Listible - URL listings with RSS feeds

I was looking for a complete list of social bookmarking sites and here's what I've found:
http://www.listible.com/list/social-bookmarking-sites

This web site is not the new one, but what a great idea! All listings are free of spam due to its visitors. They can report spam with a single click.

But anyway, I'm going to search such lists in Google. The problem is that there are too many services and too little visitors. Listible.com has a nice design and features, but listings are not complete. I think new resources are created faster than the users find a time to add it. Perhaps such services should pay for a new relevant link!