Do you think that widespread internet use (especially e-commerce and social media) has made younger Americans more or less trusting than their...

I think that it has made younger Americans more trusting. 
At least it has made them (and even many of us older Americans) act in ways that are
less guarded than in the past.  Let us look at one economic and one social way in which
we do this.

Economically, we no longer confine our
transactions to people we can see.  We easily give our credit card numbers to businesses
over the internet.  We buy from people we will never meet.  This is more trusting than
in the old days when we did business with brick and mortar stores in our own towns or
neighborhoods.

Socially, we are much more open with facts
about ourselves.  We get on Facebook and post things about ourselves that we might not
have told such a wide variety of people in past days.  In this way, we are trusting them
with sometimes very personal things about us.

In these
ways, younger Americans clearly seem more trusting than past
generations.