Google stands by decision to end tablet-based ad campaigns

Google is making big changes to AdWords which is its main money machine and a major engine of online advertising. The company is framing the changes as a benefit — but they may shortchange advertisers and publishers.

Siri, where did my mobile ad revenues go?

Are Google, Yelp and Facebook scared of Siri? If they aren’t they should be, as should any mobile website, service or app that depends on advertising. Siri is the first user interface that shifts our attention away from our phones’ screens, but it won’t be the last.