WPP chief executive Sir Martin Sorrell has warned companies that the rush to "cut your way to growth" is handing too much power to procurement teams when it comes to advertising budgets -- a shift that is emblematic of marketers becoming "too quantitative and not qualitative enough." Marketers are set to come under increasing cost pressures in 2015 as the likes of Mondelez and Coca-Cola introduce new measures designed to breed a more sustainable culture of cost-cutting.

Publicis Worldwide has relaunched Nurun, its digital product service and platform development arm, to create a global unified digital offering featuring 4,000 experts across 30 offices globally. The relaunch will see Nurun provide digital solutions across many of the Publicis Worldwide office locations such as San Francisco, Shanghai, Montreal and Madrid and other parts of the Publicis Worldwide network, including Poke in London and Ineo in Shanghai.

Uber has partnered with music streaming site Spotify to give users the ability to choose the music played during their taxi journey, as the ride-sharing app looks to differentiate its offer in an increasingly competitive marketplace. From Friday, Uber customers who have a premium account with Spotify will be able to link their playlists to the Uber app and select the music they want to hear when they get in a taxi. The functionality will be available in 10 cities initially, including London, Stockholm and Singapore.

If you wondered which newspaper readers are most likely to own a cat ("Daily Telegraph"), which are most likely to own a dog ("Daily Express") or which like Neopolitcan ice cream the most ("Daily Star"), there's a YouGov report for that. The research rounds up different surveys to build a picture of who is reading each paper. Waitrose customers, for example, tend to read "The Guardian," while chips, ham and eggs are the staple of the Daily Mirror" reader. Unsurprisingly, the keenest sailors read "The Financial Times.""

Karen Blackett, the chief executive of WPP's MediaCom, has been named the most influential black person in Britain, in the Powerlist today. The 43-year-old leader of the UK's biggest media agency is the first businesswoman to top the Powerlist. The list also includes Oscar-winning director Steve McQueen, a Google executive and several MPs. Since becoming chief executive four years ago, Blackett has helped to launch the first Government-backed apprenticeship scheme for the creative industry.

Nokia promised it was about to resurrect its brand on new products imminently -- and it looks like we'll see the first device today. In a cryptic tweet from Nokia's official Twitter account, the company hints that it's "up to something" to coincide with Finland's Slush conference today. An image accompanying the tweet is simply a mysterious black box furnished with a Nokia logo. All will be revealed today when Nokia's product business head, Sebastian Nystrom, presents a "what's next for Nokia" session at Slush.

Facebook is secretly working on a new Web site called "Facebook at Work" to get a foothold in the office that will see the social network of more than 1bn people compete directly with Google, Microsoft and LinkedIn. The Silicon Valley company is developing a new product designed to allow users to chat with colleagues, connect with professional contacts and collaborate over documents, which will compete with Google Drive and Microsoft Office, according to people familiar with the matter.

Uber has rolled out its car hire app in Leeds, making it the third city in the UK where users can book and pay for cab rides through the app. Following on from London and Manchester, those in Leeds will be able to request a taxi by downloading the app and pressing to request a car, with phone GPS being used to track the user's location. When waiting for the taxi, the user can see the driver's photo, name and car registration, as well as being able to see the car's progress to the pick-up point in real-time.

Facebook has set out plans that will see promotional posts that ask fans to buy something, enter a competition or install an app appear less in news streams. This comes just days after Facebook revealed a new set of privacy policies that will allow users to query why they have been targeted with certain ads. The move will see posts that purely push viewers to buy something, posts that push people to enter promotions and sweepstakes with no real context and those that reuse the exact same content from ads penalised.

Airbnb is moving beyond its internet roots into the world of publishing with the launch of a glossy quarterly magazine. The apartment rental Web site is launching the first edition of the magazine this week. The 128-page magazine, called "Pineapple," is a glossy coffee table production of the same ilk as i-D or Wonderland. The magazine promises to take a "new and inspiring look at travel through the lens of the Airbnb community". Each edition will explore three cities, with London, Seoul and San Francisco featured first.