Marketers consistently overestimate how much of their budget they will spend on social media as they struggle to integrate it with the rest of their strategy or prove ROI. Social media is failing to meet projections as marketers consistently overestimate how much budget they will dedicate to sites such as Facebook, Twitter and Snapchat.

Google is to be summoned before the government to explain why taxpayers are unwittingly funding extremists through advertising, "The Times" can reveal. The Cabinet Office joined some of the world's largest brands last night in pulling millions of pounds in marketing from YouTube.

The MailOnline columnist Katie Hopkins has said it is "very likely" she will challenge a court ruling that she libelled food blogger Jack Monroe on Twitter. Monroe was awarded GBP24,000 in damages last week in a row over tweets suggesting the writer approved of defacing a war memorial during an anti-austerity demonstration in Whitehall.

SapientRazorfish will focus on "digital transformation" by helping clients with digital business strategy, customer experience, data, marketing, IT and commerce. Publicis.Sapient said the "deep expertise" of Sapient Consulting and DigitasLBi will help the agency "deliver customer-centric digital transformation for across the entire enterprise from CMO to CIO."

It is not front-page news that print media -- and particularly newspapers -- are suffering from falling ad revenues. According to eMarketer's latest UK media ad-spending forecast, print newspapers will attract approximately GBP1.46 billion ($1.97 billion) in ad expenditures in 2017, down 9.0% from last year. By 2021, spending will decline to GBP1.23 billion ($1.66 billion).

O2 has become the first brand to measure the effectiveness of Facebook ad impressions with its agency partner Havas. Results found converter rates improved by between 16% and 123% when Facebook Custom Audience ad placements were used in combination with other digital channels. O2 also saw a 52% improvement in cost efficiency for new customer acquisition.

The Cabinet Office, Transport for London, the Financial Conduct Authority, "The Guardian" and L'Oreal have pulled their ads from YouTube. A further investigation by "The Times" has found that the brands are unwittingly funding extremist videos. As a result, the brands have pulled millions of pounds worth of advertising from the video platform.

Three years after its UK launch, Sky is embarking upon the pan-European rollout of its addressable TV platform Sky AdSmart in a process that will see it fully deployed across its wider EU footprint, including Germany, Ireland, Italy and Austria by the close of next year.

Rupert Murdoch's GBP11.7bn takeover bid for Sky is to be investigated by the media regulator to see whether it gives the mogul too much control of news output in the UK and whether the Murdoch family are "fit and proper" owners following the phone-hacking scandal. The culture secretary, Karen Bradley, has referred 21st Century Fox's bid to buy the 61% of Sky it does not already own to Ofcom.

Branded by some as the "bad guy" in the current transparency crisis, the online behemoth argues that those concerns will only ever abate if advertisers work with it to move the value of media beyond price.