In your face.

I'm not a Facebook user, but I think some of you are. If so, you may want to start screaming at them now; a new policy allows them to post the details of all of your online transactions to other Facebook users, unless you specifically opt out every time you make a purchase. This is essentially for the purposes of marketing - they'll build a profile of your purchases and farm it out to advertisers - but its also a really great high-tech solution to that nasty problem of actually being surprised by gifts...