Yes, and not only PageRank: they've done the same thing with BigTable, GFS, etc. They're masters of selective disclosure. Two things one often hears about Googl

Yes, and not only PageRank: they've done the same thing with BigTable, GFS, etc. They're masters of selective disclosure. Two things one often hears about Google is how open they are and how secretive they are, and what's remarkable is that both are true.