I know you're using social media sites to promote you business and share information about your field. Let clients and collaborators, friends and relatives know where they can find your content.
Use your e-mail signature as advertising space. Add a link to all of your sites: your website, blog, LinkedIn, Twitter, Facebook, and any other pages where your content is featured. Go ahead - the space is yours.
Maximize the space on your business card. Be sure to include all of the sites listed above. Vanity URLs make it easier to type them out. If you're running out of space on the card, eliminate the fax number. (How many faxes do you get a week?)