* Advantages:
- It's more easy for people to make friends all over the world
- You can share your photos, videos,...
- You can keep in touch with many of your relatives, friends,...
- You can easily search for useful information
...
* Disavantage:
- If you are too concentrated on fb, you will forget people around you or you will wallow in virtual world
- If you look at your smartphone or laptop or tablet for long hours, you may be near-sighted
- Your health will be affected if you stay up too late to surf the fb
...