On social media, for example, we get to see the projections of what people want to be and the underlying darker sides of their personality (narcissism, selfishness, etc). This was always there but latent or hidden... stuff that happened behind closed doors that only families knew about. Now it's public...
Meanwhile the alienation or isolation... as a European, what freaks me out every time I'm in the US is the dependence on cars for everything. That in many places it's not possible to walk to the grocery and get fresh air... That you're in a permanent state of semi-isolation, breathing air-conditioned oxygen with the only human contact being with people that are paid to smile. Contrast that with visiting a city like Kiev where, in the evening after work, the city parks are filled with families enjoying the sunset (when the weather is warm).
I've have the theory that Internet adoption has always been fastest in the US, compared the the rest of the world, because it's the only way to get any kind of "real" connection to other people. The driver - loneliness - was always there, the product of car dependence, television and an entrepreneurial culture that tends to want to monetize any kind of human interaction, even friends (Amway, pyramid marketing).
Ultimately I think it's a good thing, that this stuff is becoming visible and we're realising there is a problem. That's the first step to find the solution.