Questions on "A Deep Dive into Facebook and Datalogix"

"A Deep Dive into Facebook and Datalogix: What's Actually Getting Shared and How You Can Opt Out" (Reitman):

1.  Would more people opt out of the program if they knew that Facebook was sharing information with Datalogix?

2.   "Due to the large sample sizes that were being tested, it would be impossible to figure out whether a specific individual bought a specific item"  Can Datalogix really determine the effectiveness of an ad if this is true?

3.  "Apparently Facebook also sent in a privacy and security auditor to assess this issue, and was satisfied with the results."  Shouldn't this be a third-party auditor?  It isn't much of a surprise that Facebook's privacy and security auditor was satisfied with the results.