Engineering excellence and user generated content (UGC) have propelled YouTube to Facebook-level reach, with growing viewing in all demographics and on the TV-set

However, the commercial limits and PR risk of its long-tail content model have prompted a diversification effort involving subscriptions and long-form content

Becoming a major part of Google’s revenue amid fierce OTT competition would require YouTube to be more flexible in its partnerships with the AV industry, and a more aggressive go-to-market strategy

In this report we develop a rough segmentation of the adult population by level of online use: offline (10% of adults), shallow online (10%), deep online (80%). We examine how online services seeking to reach new audiences increasingly face the obstacle of missing demand rather than a lack of consumer skills or access

The app economy still relies on a limited consumer pool, but ecommerce is now reaching almost all of the deep online. Bridging the current gap between occasional and frequent online buyers is a clear opportunity and we are still in the early days of evolving buying services into shopping services

The only industry monetising all online users is advertising. Ad platforms, led by Google and Facebook, also play a critical role expanding the ranks of the deep online and online immersed. But offline brand display media, led by broadcast TV, remain critical for online brands wanting to expand their audience

We forecast UK display adspend to grow by 3.1% in 2018 (<1% in nominal terms), with TV roughly steady, newspaper decline slowing and digital growth slowing a little

Households are facing an income squeeze and the ability of debt and credit to carry them over is reaching its sensible limit. Brexit-related uncertainties remain the single strongest drag on business investment, dampening ad spend

TV spend is the £5bn question. While live viewing continues to decline, TV delivers against different marketing objectives from precisely targeted online inventory, and rapid broadcaster VOD growth will help hold TV spend steady

Even with the decline in linear television viewing, online video remains a small component of total video consumption. The growth area is unsurprisingly SVOD; subscription video now makes up about two thirds of the UK's digital video spend.

Netflix is moving from an aggregator of content to a "channel" in its own right, increasing proportionate spend on original programming, something that the public service broadcasters are unable to do for differing reasons. Amazon had a tough 2017 for video, and are still struggling to create a hit.

New Nielsen audience data suggests that the long-term "library value" of Netflix's originals may be overstated, while the BBC's iPlayer continues to be hampered by not really having a library at all.

Almost half of Facebook’s impressive revenue growth and turnover is still reliant on the US, where user growth has slowed down

Among GAFA platforms, Facebook’s core business is the one most directly dependent on dwell time, but the metric for the crucial home market is clouded in mystery

The company has yet to create significant compensating revenue streams outside display advertising, raising the importance of international markets for Facebook’s future