Essentially, it suggests that our increased spare time has previously been used up passively by television. Since we now have computers, interactivity and the Internet, we're no longer satisfied by just watching - we want to take part in some way. The interesting statistic is that it would take as much 'brain time' to produce 100 Wikipedias from scratch as is used in 1% of all the television we watch.
It remains to be seen how we'll all use this spare time, our desire to participate, and to think. Once it's all happened, come and get me, as I'll be watching endless re-runs of Friends ;-)