If you would like to redistribute this article please respect FT.com's ts&cs and copyright policy which allow you to: share links; copy content for personal use; & redistribute limited FT content. Email ftsales.support@ft.com to buy additional rights. http://www.ft.com/cms... Facebook has launched a service that allows businesses to offer users deep discounts through its smartphone application. Users physically out shopping who “check in” to the Facebook Places programme via their mobile smartphone will be presented with an offer they can redeem immediately in the store. - Chris Abraham