Some thinkses not thought through…
– can web ads feed paranoia, particularly retargeted ads that follow you round the web?
– can personalised ads be upsetting, or appear bullying? For example, suppose you’re critically ill, or in debt, or you’ve been researching a sensitive personal or family matter, and then the ads start to hound you and remind you about it…
Is one take on privacy that it is not to be reminded about something by an external agency? (Is there a more memorable quote along those lines somewhere..?!)
Are personalised ads one of the more pernicious examples of a “filter bubble” effect?
I think I need a proper holiday, well away from the web!
OUseful.Info, the blog... 
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@fridolin :-) Btw, we may be coming to chat to you about Crunch sometime, and extent to which a similar approach may be used in a new level tech.computing course on data…
anytime, Tony!