We're entering a strange world where everything can be connected
I personally think that the lack of some common sense of scrubbing individuals names, addresses, phone#s, personal identification, etc. needs much better controls at both ends (extract and load).
However this may not be totally useful since the algorithms can now detect who you are based on many correlative information.
Let's start with a login name - probably close to something else you use.
Then your IP - helps. Your cookies (mmm)
The topics you are interested in (even hovering over a link lets the web site know you are thinking about clicking.)
The sites you visit. The ancillary sites you allow to be loaded if you are paranoid.
Best of all, the way you enter free-form text when requested (such as this.) I bet any decent 3-letter agency (and their commercial cohorts) would know who I am by the contents of this little text box.