Hey guys, I want to make a collection of sites that will automatically post a backlink to your site every time you update it. So far I have found a few and I am looking to get a bigger list. I will share the ones i use right now

Twitter
Facebook pages
Friendfeed
Tumblr
mybloglog
Technorati


I know hubpages and squidoo have the RSS modules but I am looking for sites that post permanent links. If you know any share them here and I will keep building this list and share it later.