1.There/ both/ many good things/ many potential dangers/ social network.

->There are both many good things and many potential dangers about social network.

2.It/ important for parents/ teach/ their children/ how/ use/ social media wisely.

->It is important for parents to teach their children how to use social media wisely.

3.Social network/ be/ start ở bad things/ like cyberbullying.

->Social network can be the start of bad things like cyberbullying.

4.Recent resports/ say/ many teenagers/ have / online contact/ strangers / and/ it/ make/ them/ feel scared or uncomfortable.

->Recent reports say that many teenagers have online contact with strangers and it makes them feel scared or uncomfortable.