Yahoo says that visitors to Tumblr have grown by 40% since it acquired the blogging service in May 2013, and expects that growth to fuel more than $100m in advertising revenues in 2015. Yahoo's chief executive Marissa Mayer told analysts:"Over the past 15 months they have seen strong growth. Their audience grew 40% from 300 million to more than 420 million users. The number of registered blogs nearly doubled from 105 million to 206 million, mobile monthly users of their mobile app grew by 50%."

The IPA has voiced concerns after Telefonica reversed its appointment of Publicis Groupe's ZenithOptimedia and hired Havas to handle its GBP200 million European media account after a process estimated to have cost agencies $4 million (GBP2.5 million). Paul Bainsfair, the IPA's director-general, said: "The IPA New Business and Marketing Group would like to express concern over the reported outcome of this process... The impact of poor pitch practice on agencies can be far more crippling than many clients appreciate."

According to IPG's third-quarter results, the group generated revenues of $1.84 billion, up 8.3 percent year on year. On an organic basis IPG's revenue increased 6.3 percent. Overall revenue for nine months was $5.33 billion, an increase of 0.6 percent from $5.00 billion for the period last year. IPG's income before income taxes was $157.5 million, up 104.5 percent year-on-year. The group owns agencies including FCB, Initiative, McCann, Lowe and Partners and R/GA.

WPP chief Sir Martin Sorrell has said he is "puzzled" by some of the debate circulating around transparency in the programmatic ad trading market. Speaking at the Ad Tech conference in London he described WPP's trading desk Xaxis as an "agnostic" proposition and said when it moved into the space it gave existing clients and opt-in choice rather than opt-out. "We decided to do this on an opt-in basis. We ripped up 2,500 media contracts. We explained to clients what was happening and told them they could opt in."

Microsoft is set to replace the Nokia brand name with Microsoft Lumia in some parts of the world starting with France, as the company quickens efforts to phase out the former from future smartphones. The rebrand will begin in France with the technology business confirming on Facebook that the brand is being axed in the country. Microsoft's UK comms team were unable to confirm whether the move would be made in the UK anytime soon or how it would impact future marketing plans.

Adobe and Nielsen have teamed up to deliver an online media rating system similar to that in place for measuring the success of shows on TV. The new tool will, for the first time, measure the engagement of online TV, videos, games, audio and text products, across a diverse range of devices and platforms including desktops, smartphones, tablets, game consoles and over-the-top boxes. The collaboration will see Nielsen's digital audience measurement products combined with Adobe Analytics and Adobe Primetime.

Coca-Cola marketers will be asked to justify spending on all new brand activity rather than use budgets being based on the previous year's spend. The move is in response to Coke's media investments in the second quarter, which chairman and chief executive Muhtar Kent admitted "underperformed compared to the [available] opportunities" such as the World Cup. He said it would implement the zero-based budgeting initiative to marketing as well as across the rest of the business at the start of 2015.

It isn't usually associated with the digital world, but the United Kingdom Independence party is proving itself to be pretty social media-savvy. A YouTube video of its calypso song has been shared widely online, with Nigel Farage tweeting supporters yesterday to buy the track and make it No 1 in the singles chart. #Ukipcalypso trended on Twitter on Monday as a result. The party is currently polling at 15% but has disproportionately high levels of social media engagement for the size of its membership.

Omnicom has revealed a 7.4 percent increase in worldwide revenue to $3,749.6m for the third quarter of 2014, as well as total pre-tax charges of $8.8m for its failed merger with Publicis Groupe. The global marketing services network that owns TBWA, OMD and DDB recorded a year-on-year growth in global revenue from 2013's figure of $3,490.5m and a rise in EBITA of 13.6 percent to $460.5m for the same period. Domestic revenue for the quarter reached $1,996.3m -- 10 percent higher than the same quarter last year.

The pressure on Yahoo boss Marissa Mayer eased on Tuesday evening, as the struggling Internet company returned to growth. Sales rose 1pc in the third quarter to $1.09bn, ahead of the firm's own forecasts, reversing a 4pc decline the previous quarter. The growth marked only the second time Yahoo has increased sales in the last six quarters. Last month, activist investor Starboard Value accused Mayer of allowing the company's core business to stagnate, and called for the firm to merge with its rival, AOL.