This is one of those nicely ambiguous counterfactuals. Contrast, as David Lewis does:
If Caesar had been in command [in Korea] he would have used catapults
If Caesar had been in command he would have used the atom bomb
In this case I am thinking about catapults. I mean Twitter is obviously a much simpler system than the web and in that respect it might have been easier for a researcher in 1992 to dream up a good way of … Keep Reading