If your site is up and running, your business should also be represented on the social networks like Twitter, LinkedIn, and Facebook. Be sure your profile page includes links to your website and one that takes them directly to the opt-in form. Post frequent status updates (3 to 4 per week), and balance the messages to about one direct ad for every six or seven interesting, non-advertising postings. Sign up to follow or friend other businesses or profiles that are likely to draw your target market, and look for groups or directories that will post your business profile for free.
Everything you do to promote your company online should also promote your website and opt-in program. All emails and newsletters should include a call to action for the reader to forward to a friend, all pay-per-click ads should visibly include your web address. Be sure all your online messages, whether small ads or weekly newsletters, reflect the image you want to portray and target the audience you need to target and include content that will encourage your loyal customers to forward them on.