Computer usage.
According to Statistics Canada’s recently published General Social Survey—2010: Overview of the Time Use of Canadians (PDF):
… the proportion of Canadians reporting using computers (excluding using a computer while doing paid work) for such things as email, on-line social networking, and searching for information increased nearly five-fold between 1998 and 2010, from 5% to 24%. In 2010, computer users spent an average of 1 hour and 23 minutes on the computer on the diary day. Computer use increased significantly across all age groups. In 2010, the age group with the highest proportion of computer users continued to be 15- to 24-year-olds (at 32%). This group spent, on average, 1 hour and 41 minutes a day using the computer.
You don’t have to reflect on this very long to realize how significant this change is, in how computers have penetrated our society.