This is a small awareness minisite that we built to educate visitors in the simplest possible way about what behavior usually requires you to maintain a privacy policy on your site (and how we can help fixing that gap).
First it's in Google's terms, have a quick look here there's an interesting write up regarding this topic that covers it better than I could here in this short amount of time: http://searchengineland.com/how-many-google-privacy-policies...
Secondly GA collects personal data from your users which in most legislations means that you need to inform users about that fact (most notoriously Europe).