Any of various extremely small, often disease-causing agents consisting of a particle (the virion), containing a segment of RNA or DNA within a protein coat known as a capsid. Viruses are not technically considered living organisms because they are devoid of biological processes (such as metabolism and respiration) and cannot reproduce on their own but require a living cell (of a plant, animal, or bacterium) to make more viruses. Viruses reproduce first either by injecting their genetic material into the host cell or by fully entering the cell and shedding their protein coat. The genetic material may then be incorporated into the cell's own genome or remain in the cytoplasm. Eventually the viral genes instruct the cell to produce new viruses, which often cause the cell to die upon their exit. Rather than being primordial forms of life, viruses probably evolved from rogue pieces of cellular nucleic acids. The common cold, influenza, chickenpox, smallpox, measles, mumps, yellow fever, hemorrhagic fevers, and some cancers are among the diseases caused by viruses.
The campaign became successful and viral with over 17 million people participating in the challenge worldwide. Many celebrities including Bill Gates, George W. Bush, Oprah Winfrey, Tom Cruise, Mark Zuckerberg, Rihanna, Tim Cook, Rafael Nadal, and Cristiano Ronaldo took part in the challenge. Below video shows the Ice Bucket Challenge taken by Bill Gates:

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The campaign became viral because it could connect to the audience emotionally. People could relate to the concept of the video. The idea was original, and the content was enticing without pushing the products. The ad encouraged social conversation and sensitivity around the beauty of a woman. It empowered women, evoking feelings of warmth, joy, and confidence. Empowerment is a powerful tool, which can enhance the brand image of your company. So build an uplifting relationship with your audience.
According to a paper by Duncan Watts and colleagues entitled: "Everyone's an influencer",[66] 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.