There are lots of great services on the internet like Twitter or Del.icio.us where you can have online conversations and share links about stuff you are interested in. The Drupal contributed activity stream module helps you to gather all of them together so that you can show these on your website.
Create something interesting to link to like a daily top 10 and then publish result to website, twitter, opt-in email, etc. Once you have a top 10 you have something for people to link too.