Diigo, Digg, delicious, StumbleUpon: they all allow you to turn a personal initiative (bookmarking a Web page) into a social gesture so that the wider world can be alerted to content you admire. By offering social bookmarking buttons on your posts and pages, you let visitors "vote" on your content, thereby lifting its visibility.
Find the bookmarking sites that make the most sense for your industry Encourage visitors to bookmark your content via visible tools (buttons) on your site Enlist loyal customers to help you submit, vote or comment on specific content