Half Price Books, Records, Magazines Inc. got a lot of love when the added social links to a recent email campaign. To promote its Book Lovers’ Weekend event around Valentine’s Day, the retailer sent two different promotional emails to its 1 million email subscribers and the messages encouraged recipients to share the offer, and included links to Twitter, Facebook and Pinterest. Within a week of the campaign, the company had 36,000 new email subscribers and more than 14,000 consumers redeemed one of the coupons in the company's stores.