Social media can be defined（解釋）as web-based and mobile media that are used for people to interact，connect and communicate with each other.It often involves the creation and sharing of content（writing，pictures，and videos）that people make themselves，mostly through the Internet.
    （1）

D

D

The first type involve people getting together to work on a project，for example，Wikipedia.Blogs and microblogs（such as Twitter）are another type of social media.There are other websites like YouTube that allow people to share content such as pictures，articles or videos.Another type of social media are social networking sites.（2）

A

A

Facebook is an example of this type.Many people like to play games on the Internet and，yes，there are social media games as well.These games allow gamers to interact with each other and play with or against other gamers.World of Warcraft is a good example.The final type of social media is websites like Second Life，where people can create avatars（化身）and use and create objects，as if they were in the real world.
   （3）

B

B

With social media，many individual people in different places create content.Another difference is that people who produce content in social media don't need very special skills.（4）

C

C

It takes only a few minutes to write a twitter post，for example.
   （5）

G

G

But whatever you might think，social media is here to stay.

A.These sites allow people to stay in touch with friends，make new ones and join communities.
B.Social media are different from traditional media.
C.And social media content can be produced much faster.
D.In general，there are six different types of social media.
E.Social media is one of the fastest-growing industries in today's world.
F.In traditional media，people need special skills to produce something.
G.Some people think social media is good and some think it is bad.