[thewarrior]

But surely as more and more data is gathered over the next decade , this sort of thing could become feasible ?

For eg: I know for a fact that FB is betting very heavily on travel advertising. FB wants to be the go to place for travel companies to advertise their products , so FB has an incentive to make people travel more.

They could do this prominently highlighting when people travel to a certain tourist spot etc...

[SolaceQuantum]

It wouldn't be just about gathering data, but also developing the algorithms that are capable of that specialization to each person. No matter how good your data is, the lack of an algorithm to examine the data and recognize applications for each unique person to manipulate behavior using a strategy that must recognize it's own applicability at that moment is going to be the huge hurdle.