The promise of stronger sales and profits will make it hard to resist tinkering with a book in response to such signals, adding a few choice words here, trimming a chapter there, maybe giving a key character a quick makeover.

WSJ: Nicholas Carr on E-Books

In response, people generally want others' behaviour to change, but resist having their own freedoms curtailed.

ECONOMIST: A Survey of the 20th Century

The only effective response, as watchdog groups now realise, is to use the Internet itself to resist extremists.

ECONOMIST: The Internet