Briefly define the five different types of digital media channels. Compare and contrast each channel by identifying its strengths and limitations. Provide at least one example for each digital media channel.
Digital media channels include: Search engine marketing (search engine optimization and pay-per-click), online public relations (PR 2.0, social networks, and blogs), affiliate marketing (commission-based referrals), viral and electronic word-of-mouth marketing (e-WOM), and opt-in e-mail.