This might just be a weird ass conicidence, but lately I've noticed that several adverts on my PC are based on web searches that my partner has made on her iPad or via her phone.
We don't share accounts, nor devices, and yet somehow adverts matching sites she's visited are being served up by sites which, in the past, I know have served behavioural targeted adverts.
Is this just a paranoia inducing coincidence, or do we think BT (aka Plusnet) are subsidising their broadband packages by selling behavioural advertising information based off IP address ranges?