"Sick of Hayfever? Simply lock the POLLEN OUT OF YOUR HOUSE with WindowFilta as seen on TV (I am omitting the link)".
Yup, assuming I never left my house that would solve the problem an absolute treat. I hope they sent it to me because I mentioned hayfever in a tweet, not because I tweet so much their behavioural targeting software can tell I never go out. I have a smartphone damn it! For all they know I could be tweeting from a party on a frickin yacht.