What is a social network, anyway?
To a consumer, a social network might be a place to share memes, cat photos and selfies.
But to a business, a social network is a place to bolster and defend branding, share product information, interact with customers and participate in relevant conversations with the world.
Businesses have websites. So why do they need to be on social? Because social is where the customers are, and where customers go to praise or complain about companies to each other...