The campaign didn’t target Dove’s products but instead focused on changing a woman’s perception of how she sees herself, also changing the way how Dove is viewed as a company. It is said that “Woman aged between 18-34 are twice as likely to think highly of a brand that made an empowering ad and nearly 80% more likely to like, share, comment, and subscribe after watching one.” Through the video, Dove wanted to make women realize that they are overly-critical of themselves to make them feel better about their appearance.

YouTube brought in nearly $4 billion in estimated ad revenue in 2018. So you can earn a potentially large income by uploading videos to the platform and then watching those ad dollars roll in. You may need or want to upload videos regularly, which isn’t especially passive. But you don’t need to provide a specific product or service directly to customers.
The most viral products are those that only work if they are shared. For example, Skype only worked in the early days if you got your friends on to Skype, otherwise you had no way to call them. If you have an application today, think about how you can make it social, where it would work better by sharing data with friends/co-workers. That provides a great incentive for customers to invite their friends/colleagues to use the application.

The main risk coming from the company is for it to target the wrong influencer or segment. Once the content is online, the sender won't be able to control it anymore.[63] It is therefore vital to aim at a particular segment when releasing the message. This is what happened to the company BlendTech which released videos showing the blender could blend anything, and encouraged users to share videos. This mainly caught the attention of teenage boys who thought it funny to blend and destroy anything they could;[64] even though the videos went viral, they did not target potential buyers of the product. This is considered to be one of the major factors that affects the success of the online promotion. It is critical and inevitable for the organisations to target the right audience. Another risk with internet is that a company's video could end up going viral on the other side of the planet where their products are not even for sale.[65]

What happens when you grow so fast that you start to saturate the population. This has happened to several Facebook app developers. They experience very rapid growth, and then suddenly the growth dies. Andrew Chen has written a great blog post about this:  Facebook viral marketing: When and why do apps “jump the shark?”. (Side note: I don’t believe that the equation that Andrew puts forward for simple viral growth is correct, as it assumes that the entire population will continue sending out invitations at each viral cycle. However his work on saturation of the population is very relevant for highly successful viral apps.) In case you are interested in where the term “jump the shark” came from check this out: Wikipedia: Jumping the shark.
Viral marketing or viral advertising is a business strategy that uses existing social networks to promote a product. Its name refers to how consumers spread information about a product with other people in their social networks, much in the same way that a virus spreads from one person to another.[1] It can be delivered by word of mouth or enhanced by the network effects of the Internet and mobile networks.[2]