If you're involved in various forms of social media, chances are that somewhere, some of your private information has become public—although not necessarily in plain format—it could be snippets of seemingly harmless personal content which could be used like puzzle pieces from here and there to assemble a full picture.
Where could those pieces be found? Silly Facebook "quizzes," and apps, newsletter sign-ups, phone apps, email registration, fake raffles, shopping lists, poorly chosen user names, public events websites, career networking profiles, websites which have been targeted by...