2. Twitter
It is used all over the world.
You can write what you think, what you are doing, post pictures and
videos.
It can be used to stay connected with your friends no matter where
you are.
A lot of famous people use it.
They make publicity.
It can be entertaining.
3. Instagram
It is used all over the world too.
Unlike twitter it is only for pictures.
Also famous people use it as well as famous brands and for publicity.
It is fun to watch pictures from different parts of the world where you
have not been
4. YouTube
It is used basically for videos.
I used it to upload a soccer video about me so college coaches
could recruit me
You can learn important stuff, like fixing your car, or just learn about
math or other subject for school.