I am still laboring, along with Sam Hunting, to put the final touches on our Balisage presentation: Spreadsheets – 90+ million End User Programmers With No Comment Tracking or Version Control.
Before you ask, yes, yes it does use topic maps to address the semantic darkness that are spreadsheets. 
The reason for this post was that I ran across a spreadsheet today that listed both public and private phone numbers for a large number of oil & gas types. Too old now to be much of a bother but just an FYI that prior to checking big data sets, check for private phone numbers as well as SSNs.
BTW, I was rather amazed at the large number of things that “spreadsheets” are used for in fact. Auto-processing would create nearly as many problems as it would solve. I have seen documentation, unnamed content, letters, other content. Does it never occur to anyone to use a word processor?