U.S. users increased their time using social networking apps 83 percent last year, according to Nielsen Online. In fact, total minutes spent on Facebook increased nearly 700 percent year-over-year, growing from 1.7 billion minutes in April 2008 to 13.9 billion in April 2009.
One wonders what all those users are doing less, as they network more. Even if one assumes multitasking is going on, attention and time still are linear. People can't do more of one thing withoug doing less of another, or at least are attention sharing to the point where it is questionable how much actual attention is being paid to something that is "available and in use."