I've just had the chance to watch Clay Shirky's TED talk from May of this year on how the likes of Twitter, Facebook and other social networking sites are changing the fundamental notion of media and media construction and consumption. If you haven't heard it, spend 17 minutes now ... it is well worth the watch.
This video complements perfectly Ray Kurzweil's on the continued exponential growth in computing in general terms. (If you haven't seen Ray's original talk from 2005, then watch it first!) Thanks TED!