This study is part of a large project on design-relevant characteristics of ageing users.
Traditional information technology (IT) development adopts a systematic approach without necessarily using a specific user model that personalizes the system to the aging user groups.
Time's Christopher Matthews recently cited a study that concluded that, compared to 2011, Facebook has almost five million fewer high-school-age users and almost seven million fewer college-age users.
But even some high school and college-age users of the site, who freely write about their love lives and drunken escapades, are protesting.
Mr. Sullivan of Facebook said the company blocked new registrations or deleted the accounts of thousands of under-age users every day.
(A MySpace spokeswoman, Tracy Akelrud, said the site used other controls to detect under-age users. "If you are under 17, you will be blocked," she said).
Mr. Magid and other researchers say the social networks fail to provide under-age users with tools that might protect them.
As for the trade commission, Richard F. Kelly, a senior lawyer, said it planned to examine the PC rooms in its next report on the marketing of video games and other entertainment to under-age users.
Snapchat built the age gate to make sure alcohol ads aren't shown to kids, but it could be used so campaign ads only reach voting-age users.
The result infers the different demands in different age users, so the smart classroom should consider multi-level intelligence learning activities for each stage students within K12.
