Since a decade ago, US college students have started to lack emotional empathy for others.

The small sample size means that we shouldn't be entirely sure of this result. If it holds up, it could be an effect of some or all aspects of technology, but it isn't obvious a priori which aspects would be responsible. It might have been due to growing up with cable TV.

It might be a response to the precariousness of employment, caused by the financial crisis, and the consequent lack of good jobs.