This is a good article, but I think you could argue that the point is that this bubble isn't like the last bubble. No bubble is the same as the last bubble. The sources of investment, and what is being invested in, is different in every bubble.

Bubble is such a loaded, judgemental term. How about over-optimistic? A lot of new things have been doing really well: Facebook, Uber, etc. So many investments are priced very optimistically. Some will succeed, many will fail. Many useful investents will be made. Much money will be lost. Unless you are an angel investor I wouldn't lose a lot of sleep over it.