Two new buttons have been added to the social bookmark page: Tumblr & Uvouch.
Tumblr is a cross between blogging and social bookmarking. You can easily add text, video pictures and more to any page with the click of a button. Think blogging, or slimmed down with no real maintenance.
Uvouch is a social site to save links and videos. Kind reminds me of YouTube with a few more features.
If you add an iFeedReaders social bookmark button to your site, you can give your visitors instant access to all the options on the social bookmark page. Or, add the bookmarklet to your browser to give you instant access to the social bookmark options from any page you browse to.