I read an eMarketer article online this morning about this very topic. Check out this chart they posted:

They interviewed Kathy Bloomgarden who is co-CEO of Ruder Finn. Ms. Bloomgarden spoke about looking at the underlying motivation of online behavior so companies can develop strategies.
Here are her words from the eMarketer article, "Intent is the new demographic."
So, what about you? Why do you go online? I really want to know.