Tumblr founder criticises rivals’ publishing of performance stats

David Karp says his micro-blogging service is best place to try out creative innovation. By John Reynolds

YouTube to offer facilities and experts to help 100 advertisers to build content

Pilot, which includes American Express and PepsiCo, is set to try to lure major companies away from TV ads. By Mark Sweney

New attempts to reach smartphone and tablet-using viewers, and measure their engagement too. By Stuart Dredge

Great Gatsby was only made in 3D to get the money back on a $120m movie, Bugsy Malone director tells Kirsty Wark. By Mark Sweney

Comedian and presenter says social media helped him rebuild an audience after he was fired from NBC's Tonight Show. By John Reynolds

WPP chief, along with Jimmy Wales and Vivienne Westwood, raise concerns over extend of data collection program. By Mark Sweney

Social network says 61% of its monthly active UK users have Liked at least one local business page. By Stuart Dredge

Cannes Lions: Chief engineer says companies still target myth of 'captive' audience and fail to embrace digital. By Mark Sweney

Chernin Group, WPP Digital and Comcast Ventures chip in to rumoured $30m round for the MCN with 2.5bn monthly views. By Stuart Dredge

Cannes Lions: Actor planning web content possibly including Tenacious D animated series. By John Reynolds

The advertising technology company hopes digital ads will continue to fund great journalism. By James Silver

As our campaign bites, Google at last takes action on US travel permits to enforce its own rules

Our story last week on the wiles of copycat websites overcharging the unwary for government services prompted a flood of mail

World's largest advertising company to integrate data from tweets into its media and analytical tools. By Mark Sweney