It's a wonderful thing when people make interesting data sets available to the public. When Thomas Jones wrote a paper in Econometrics about the growth of US retail giant Walmart, he made the data he collected about every Walmart store opening in history (location and date) available to the public. Since then, several people have used different techniques to visualize the data.
Corey used an R script to create this animation above, which you could easily adapt to other geolocated data to show accumulation over time.
Many thanks go to Thomas Jones for making the source data available for everyone to use.