yin and bonus social networking

I think social networking is good because we can chat with our friends.And we can play many games with our friends inside the network while we are online.We can share musics photos and movies to the visitors.We can also get to know with the new friends.And we'll know whats going on in the school.
However, I also think it can be bad because we can be addict to it.Sometimes we will meet the bad people and they'll do bad things to us.It also causes global warming because we'll use a lot electricity and it will cause lots of money.If we spends our free times on the social networking ,instead of reading books and do homework it will make our school grades lower,And our parents will blame us and limit our time online.It will make our eye worst.Because the lights from the computers are bad,we'll have to wear glasses and it make we uncomfortable.