It's interesting to note how quickly the world moves. Before you can get settled into one thing, you've moved on to the next big craze, and companies crash and burn before you can say "MySpace." I started blogging in 2006, and for the next three or four years, blogs were the main way to get and share information. Now, though, the people I know who used to visit blogs often (including myself) have switched over to Facebook. Social networking is the way to go.
I think this says a lot about how temporary everything is. Every new product gets its 15 minutes of fame (or shame) before fading into the black hole of forgotten fads. Even the things that you think are popular, that you spend your money on, that you waste hours on...who's going to care five years down the road?