It really depends on the purpose IMO. If you are cross matching that data from other sources to track, it is "evil" (in the sense of people describe tracking pe

It really depends on the purpose IMO. If you are cross matching that data from other sources to track, it is "evil" (in the sense of people describe tracking people, I personally don't care). If you are using it for your own statistics (how many people visited where, screen sizes, duration, where they scrolled at etc.) I don't see any issue there.