What realities (technological, medical, political, cultural) of the 21st century do you find most daunting?

Have you ever had a younger relative/friend/neighbor teach you new technology? What was it and how did this instruction make you feel? 

Have you ever shown someone else how to use new technology? How was the experience?

What contemporary technology/inventions do you think are positive additions to society? And what do you think are negative? Explain.