Why do you need to know personal info about me?
You are referring to 'Form of housing', 'Age group', 'Country' and so on.
This information is only used anonymously in order to improve the site and sell advertisement.
E.g. we could decide to translate the site into another language, but which should we choose? The answer is in the statistics.
An advertiser wants to know how old the audience is, we can provide the answer from statistics.
We will never use the information to check up on a single user! That's a fact!