[sincerely]

Also, it's one thing to willingly give up your own data in exchange for using Facebook etc for free, but often the data they collect could reasonably considered other people's - for instance uploading your contact book to "find friends" tells Facebook what names to associate with phone numbers and helps them build "shadow profiles" (or whatever the term they use is) for users who haven't given them anything.

[puppetmaster]

This is particularly an issue when minors are present in the photo, videos, comments, etc... Dad/Mom/Uncle/Grandma shares a photo of a young family member, and without a doubt a new individual has been added to Facebook's records.

Will our kids resent our posts?