Are there any other good reads on how this technology is implemented, the shortcomings since it was first released, improvements in the algorithm, splitting the

Are there any other good reads on how this technology is implemented, the shortcomings since it was first released, improvements in the algorithm, splitting the calculations up into a map-reduce for the modern (larger) web, and anything else that might be a good read? I just googled for some implementations like this one in Go: https://github.com/dcadenas/pagerank https://github.com/dcadenas/pagerank