Web usage in reality

Following onto the idea of a web-based hyperreality supplanting reality as we know it, some basic questions occur:

• How much of our information do we get from the web?
• By what measure?
• What are the trends over time for the population at large?
• What is the trend for a typical individual?
• What does the web tend to replace, or at least, what are the trends in other media?

I would think the answers to questions like these have a large bearing on how the web affects our perceptions now, and on what kinds of predictions we can make.