This document discusses how companies like Dropbox, Coolblue, BMW, and Peerby have integrated social media into different aspects of their business models. Dropbox used social media for lead generation by rewarding referrals and social followers with more storage. Coolblue uses Twitter and direct messaging for quick customer service. BMW emphasizes product features through influencer marketing. Peerby facilitates peer-to-peer borrowing and renting through a localized social network and offers additional services for a subscription.