Sarah Jeong's Harvard lecture: "The Internet of Garbage"

boing
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I had time to watch a bit of this talk and it is quite good, I recommend watching it if you are interested in the topic (50 mins, roughly)

https://cyber.law.harvard.edu/events/luncheon/2015/10/Jeong

Essentially she is drawing broad parallels between harassment and spam, which I think is mostly correct.