MEPs have called on the European Commission to protect consumers’ privacy and personal data online by regulating the so-called “IP-tracking” systems of some commercial Internet sites, a move Brussels has so far abstained from but might be forced to reconsider given the mood in some member states. Holidaymakers looking for cheap flights abroad over the weekend may have noticed that on some websites, the prices tend to go up at each visit. One perfectly legal explanation is that there are fewer seats available. But that is not always the case. As French daily Le Monde’s consumers’ protection blog “SOS Conso”...