Scoble responds to our HN discussion:
Clearly Instagram is on to something, and I think they are doing some innovative work, but that has nothing to do with whether or not Google could build this.
Also, a stopped clock is still right twice a day: sure, Scoble was right about Twitter (and possibly right about Foursquare...we'll see), but he seems to call everything innovative and exciting. The products that flop are swept under the rug and forgotten, and the ones that make it are trumpeted as evidence of prescience.