Twitch: Why Amazon’s $1bn purchase is all about the ads

The three-year old live gaming site has a valuable audience of 50 million young people every month, many watching for hours at a time. By Alex Hern

WPP raises digital revenue target

Sir Martin Sorrell aims 45% of total revenue in next five years to come from new media and markets such as India, Brazil and China. By Mark Sweney

We wanted the web for free – but the price is deep surveillance

Advertising has become the online business model but by its very nature it involves corporations spying on users to produce more targeted results, writes John Naughton

SoundCloud introduces ads so it can pay musicians and other creators

Initiative is starting small, but with plans to make 175 million listeners pay off for individual artists and major labels alike. By Stuart Dredge

Foursquare’s relaunch has only temporarily recaptured the public

Use of the mobile-based app is up, but the confusing image overhaul is unlikely to lead to long-term success

Premium-rate ‘voice changer’ service fined £60,000 for children’s apps ads

French firm Acetelecom has been fined after some £1-per-minute calls went on for 90 minutes. By Charles Arthur

Boot up: iKettles, Moto 360, Sam Sung Apple card and CryptopLocker keys

Plus, Foursquare 8.0, hotel Wi-Fi, US chip-and-pin and Facebook and Twitter ad crackdown. By Samuel Gibbs and Alex Hern

Five brand logo redesigns that misfired and how to deal with the backlash

With Airbnb and Foursquare's new logos under fire, how can brands updating their image ensure a smooth transition?

Teenage Mutant Ninja Turtles studio apologises for 9/11 PR gaffe

Paramount Australia says sorry for mistakenly combining a picture of a burning skyscraper with 'September 11', the release date of their Teenage Mutant Ninja Turtles reboot

Google doesn’t want you to limit its ability to follow you around the internet

Dan Gillmor: Behind our screens, tech companies are racing to extract a price for what we read and watch on the web: our personal information

Behavioural tracking and neuroscience are tools for sustainable innovation

Let's ditch sustainability surveys which tell us consumers pay more for sustainability - they don't. New tools, used responsibly, can properly analyse behavioural patterns