The purpose of self -promotion is to get your name out there to your target audience and to build your reputation, identity and ultimately get you face time. Your name brands everything- business cards, on line portfolios, tweets on twitter, websites, blogs and blog posts, emails, mini portfolios/leave behinds, postcards and other specialty printed promotional materials.
You will not be paid for this promotional work but its goal is to attract paid work from employers and clients.
While traditional promotional materials attract employers and customers to invest in your work. Web 2.0 encourages people to engage with you and get to know you in many channels–blogs, forums, twitter and online portfolio/websites. It encourages audiences to spread the reputations of designers/artist/writers through their own personal networks. At the same time these new communication channels deliver feedback to create better products and services.