Definition of "virally" []

• In a viral fashion; often specifically in the context of viral marketing (adverb)
• Due to, or by means of, a virus or viruses (adverb)

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• "The Obama camp is focused on getting people to buy into a brand ethos and then spreading the word virally via social media."
• "That's not only because Facebook is making it harder to spread the word virally, but also because Facebook will face pressure to increase its share of the revenue flowing through its platform -- just as other platform providers like Google and Microsoft have done in the past."
• "Let your customers spread the word virally about your offer"