But as Mr May shows, much of the new demography stresses the variety of countries' experience and finds that huge changes are taking place between different age groupseven when the overall size of a country is stable.
Differentgroups have different estimates, and most don't separate mobile Internet users from those accessing the Web from a computer, even though the two groups face different choices of browsers.
Activity streams complement them by allowing employees to keep track of activities and messages from many different networks of people, groups and even applications in a stream of content over time, again conceptually similar to Twitter.