Nielsen reported a few days ago on Internet usage in the U.S. Although intuitive to many of us, it offers numeric confirmation of the fundamental shift in user habits online.
Social networks/blogs were where we spent the most time (906 million hours in aggregate for the month of June). Second place went to online games, at a little less than that (407 million hours), and e-mail--the bastion of baby boomers but shunned widely by X, Y, and Z generations, clocked in at a paltry 329 million hours).
In percentage change up and down, email, portals, and instant messaging took the biggest hits, while social networking, games, and online video saw the biggest increases.
Interesting also to look at the corollary for mobile users and how it was similar/different. In fact, given that email activity on mobile devices increased from ~37% to ~42%, one might conclude that email has moved off the desktop onto the handset for the most part, and desktops are being preserved for rich media/bandwidth intensive behavior.
