Also even if say you and I visit the same exact 100 sites. Order, time on site, sub pages visited, and time of day I use the sites, all can mater. Ad network

Also even if say you and I visit the same exact 100 sites. Order, time on site, sub pages visited, and time of day I use the sites, all can mater. Ad network can also leak out data as you may see a different set of ads than me.