It includes email marketing, search engine marketing (SEM), social media marketing, many types of display advertising (including web banner advertising), and mobile advertising. Like other advertising media, online advertising frequently involves both a publisher, who integrates advertisements into its online content, and an advertiser, who provides the advertisements to be displayed on the publisher's content. Other potential participants include advertising agencies who help generate and place the ad copy, an ad server which technologically delivers the ad and tracks statistics, and advertising affiliates who do independent promotional work for the advertiser.
A successful customer referral program can become the lifeblood of your business, but it won’t do anything if it’s not backed by the proper resources. The program should be strategically planned out, regularly measured, and managed on an ongoing basis. When you invest in your program, you can see unimaginable growth through this marketing channel (just look at the ROI of referral marketing by different industries). You can’t achieve success if you’re treating your referral program as an afterthought. Successful programs need structure and commitment from within your company. For this reason, many brands choose automated and streamlined platforms to ensure ease and satisfaction from both a consumer and company perspective.
According to a paper by Duncan Watts and colleagues entitled: "Everyone's an influencer", the most common risk in viral marketing is that of the influencer not passing on the message, which can lead to the failure of the viral marketing campaign. A second risk is that the influencer modifies the content of the message. A third risk is that influencers pass on the wrong message. This can result from a misunderstanding or as a deliberate move.