Not a broad enough question , but the simple answer is Yes . It is unhealthy .
The whole internet experience is bad for your mental health and happiness . Information bombardment , unrealistic interactions on so called social media sites . I don't think it's a coincidence that suicide rates have increased since the information highway has become main stream , general happiness is lower and people dissatisfied with their life is on the increase .
its not going to change , we have gone from generations who were infatuated to the introduction of the net , to generations who only know the net in their lives . It's here to stay and going nowhere .
The more you can insulate yourself from it the better .