Give your customers things to be proud of so they share with their friends. Have a thank you page, product basket, track of money spent, content, small quotes, attachments, and images. Make sue to gamify the experience of visiting your website so users are more engaged with interaction, make sure toy award leaders, do this by having each purchase level-up, having a shareable leader-board, an outlet that shows the videos and ideas they have viewed, give them achievements and clever pet names.