The document describes several challenges faced by companies and the solutions and results of their marketing campaigns: 1) A community overcame a negative image through a viral lip dub video that received over 4 million YouTube views and increased their message reach. 2) Dunkin Donuts' Facebook campaign turned profile pictures into prizes, increasing their Twitter followers by 20,000 and generating hundreds of likes and comments. 3) Klout helped Audi find influencers to promote a hashtag, generating over 12,000 tweets and a viral online conversation, winning a participant a trip and $25k donation.