Topics: social, social commerce, retail, customer acquisition, social marketing, social retail, social media marketing, facebook, marketing, campaign, referral marketing, gamification, referral, acquisition, referrals, customer engagement, social sales campaigns, brands, marketeer, promotion, selling, brand, promotions, media, innovation, co-creation, twitter, music, entertainment, music social media, Concerts, ed sheeran, O2 Priority Concerts, Music promotion, O2