Positive:
Social networks can have a positive impact on safety, such
-providing a way of contacting others in distress
-telling others that you're ok, for example during an earthquake
-going around media censonship
-sharing with the world stories of systematic abuse
-sharing the information about human rights
But they can also have a negative impact on privacy:
-a lot of data is published without the persons knowledge (pictures)
-you don't have control over your own pictures published on others' profile
-people can stalk you
-people can find out about your past
and on safety: people can harass you
