When starting any website project, it's natural to want to concentrate your design efforts on the homepage and the header. As a result, the footer often becomes an afterthought - relegated to a poorly designed dumping ground for copyright information, legal disclaimers and spammy SEO links. But it shouldn't be this way.
I like simple, clean footers like Rdio (though I would NEVER put my social at the bottom unless it is a duplicate of what I have at the top). I also like Karma.
Most of these footers, though cool, feel over-the-top to me. I want a footer to be calm and reassuring not like it is one final confusing thing (lol). M