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Interesting development in this week’s newsletter with news that Google’s plan to replace web browser cookies with a system that shares less data with advertisers is being investigated in the UK. The Competition and Markets Authority (CMA) said Google’s plan could have a “significant impact” on news websites and the digital advertising market.

The CMA has already raised concerns that publishers’ profits could sink if they were unable to run personalised ads. But Google said digital advertising practices had to “evolve”. Cookies

can  of course be used to remember what items a person has added to their online basket and deliver personalised content. They can also be used to track somebody’s activity online and deliver targeted advertising. Some cookies known as cross-site or third-party cookies can let publishers track a person’s web activity as they move from one website to another. By default, Apple’s Safari and Mozilla’s Firebox browsers already block cross-site cookies.

But Google intends to go further by ending support for all cookies except first-party ones – those used by sites to track activity within their own pages. It wants to replace them with new tools that give advertisers more limited, anonymised information such as how many users visited a promoted product’s page after seeing a relevant ad – but not tie this information to individual users.

According to one industry group opposing the move, Google’s Chrome browser is installed on more than 70% of computers in the UK. So even if other web browsers do not adopt the same approach the move would still be significant.

A coalition of about a dozen small tech companies and publishers – Marketers for an Open Web (Mow) – claims some of its members’ revenues could drop by as much as two-thirds.

Moreover, it suggests the move would put too much power into Google’s hands. The group warned “Google will effectively control how websites can monetise and operate their business. This means that any business that buys or sells advertising will be reliant on Google for a part of the process, whether they like it or not. This will reduce the ability of independent players to compete with Google, strengthening its monopoly control of online commerce.”

The group has also raised concerns about other related matters, including the tech firm’s plan to end support for user-agent strings. These are bits of text that browsers send to websites at the start of a user’s visit to reveal details about the device and browser being used. In November, the government announced it would create a new Digital Markets Unit within the CMA. The organisation subsequently detailed how it would to govern the behaviour of Google, Facebook and other tech platforms “that currently dominate” online markets, and give consumers “more control over how their data is used”.

We will be keeping tabs of course on the CMA’s investigation into Google’s plans and it will be one of the issues addressed in our upcoming virtual Future of Martech conference this Spring. Look forward to welcoming you there.

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