A survey measuring people's internet use used to be a fairly simple thing. If you dialed up to your ISP and logged onto CompuServe or AOL, you were "online" until you disconnected. Even in more recent years, you were "online" for as long as you were looking at a web browser or a chat window. But things have gotten more complicated as we've grown more mobile and connected than ever, and that's now resulted in the first ever decline of people "using the internet" in Forrester's annual survey since it began asking the question in 1997. As AllThingsD reports, this year's survey found that people spe
