Social networks have grown substantially since 2009, with nearly 148 million US internet users regularly using social networks in 2011. Marketers and media companies recognize they must have a social media presence to reach audiences. Businesses using social media platforms like Facebook, Twitter and LinkedIn are expected to grow 20-30% in 2011 and beyond. Marketing activities devoted to social media will increase to over 50% in the next two years as social networks cement relationships with users to keep them engaged through deals, sales and discounts. This virtual social media marketplace is currently worth $7 billion and will reach $30 billion by 2013.