jimbeetle - 10:55 pm on Sep 16, 2012 (gmt 0)

In context:

One thing he didn't address, however, is the rate at which Facebook's desktop usage is declining in its most mature market--the U.S. Zuckerberg also didn't comment on another ominous Facebook trend: The usage declines are most pronounced among those who were once Facebook's most devoted users: Young people.

Makes sense, doesn't it?