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Social media
Social media is a phrase that we throw around these days, often describe what we share on a site and apps such as Facebook, Twitter, Instagram, Snapchat and others. But social media is too board to define, because if we add Wikipedia and Digg, it will become more confusing. So what social media included? Or it will become wider by time to time?

Definition of social media
By time to time, internet become a part of our life. As bigger affect is does, the definition become blur.

The definition of social media from Academic representative
According to Michael Dewing, the Social Affairs Division in Parliamentary Information and Research Service mentioned in his presentation called Social media: An Introduction, the definition of social media refers to the wide range of Internet-based and mobile services that allow users to participate in online exchanges, contribute user-created content, or join online communities. Social media refer to a platform that allow users to participate in online discussion and share their own opinion.

The definition of social media from retail industries representative
According to Guram Gvasalia, the CEO of fashion brand Vetements. He mentioned a bit about of social media in the interview hold by WWD. He mentioned that "Today, because everything moves so fast, no one wants to think long-term. They buy a hoodie, they put it on, they take a selfie and put it on Instagram and it brings them closer to a certain group of people and they feel a sense of belonging. This is what the world is looking for. Before it was religion, and the brands are sort of replacing it, even if it’s sad to say that. Look at Apple basing its entire structure on the idea of belonging." As what Mr. Gvasalia mentioned in the interview, it created a image for social media, which is social media is a platform for promotion or attach those customers.

In conclusion, social media is playing a role that provide a platform for people communicate online, they can share and receive information through social media. Also, social media is also forming a bridge for cooperation to promote their products or attach the customers easily.

Different categories of social media

 * Facebook is a popular free social networking website that allows registered users to create profiles, upload photos and video, send messages and keep in touch with friends, family and colleagues. According to statistics from the Nielsen Group, Internet users within the United States spend more time on Facebook than any other website.
 * Twitter is a free microblogging service that allows registered members to broadcast short posts called tweets. Twitter members can broadcast tweets and follow other users' tweets by using multiple platforms and devices.
 * Google+ (pronounced Google plus) is Google's social networking project, designed to replicate the way people interact offline more closely than is the case in other social networking services. The project’s slogan is “Real-life sharing rethought for the web.”
 * Wikipedia is a free, open content online encyclopedia created through the collaborative effort of a community of users known as Wikipedians. Anyone registered on the site can create an article for publication; registration is not required to edit articles. Wikipedia was founded in January of 2001.
 * LinkedIn is a social networking site designed specifically for the business community. The goal of the site is to allow registered members to establish and document networks of people they know and trust professionally.
 * Reddit is a social news website and forum where stories are socially curated and promoted by site members. The site is composed of hundreds of sub-communities, known as "subreddits." Each subreddit has a specific topic such as technology, politics or music. Reddit site members, also known as, "redditors," submit content which is then voted upon by other members. The goal is to send well-regarded stories to the top of the site's main thread page.
 * Pinterest is a social curation website for sharing and categorizing images found online. Pinterest requires brief descriptions but the main focus of the site is visual. Clicking on an image will take you to the original source, so, for example, if you click on a picture of a pair of shoes, you might be taken to a site where you can purchase them. An image of blueberry pancakes might take you to the recipe; a picture of a whimsical birdhouse might take you to the instructions.

The power of social media
The power of social media can be performs in different sides, such as retail and and fashion, even the decision of government. There are a lots of example to prove that social media is a huge element can affects the society because the social media are representing a billion of social media users in the world.

According to Samantha Goodyear mentioned in her article Power of social media,"With the millions of apps, websites and other platforms for people to communicate through media that are all over the Internet these days, this is truly the age of social media. Teenagers like myself are among the top users of most social media platforms on the Internet. Whether it’s updating a Facebook status, fitting a joke into 140 characters or uploading a picture of our lunch to Instagram, we are on the Internet a lot. Social media is a huge part of our culture."

The using rate of social media is rising by second, and it becomes a part of our daily life. The information we received from social media become a trend of the society. A lots of celebrities or fashion brand use social media as a platform to promote their brands or new products. Use Fashion brand Vetements as an example, "A year ago, shortly after it initiated its Instagram account, Vetements counted 5,000 followers. Today that number is north of 1.3 million. Gvasalia flicks on the page’s data tracking on his iPhone to show almost 10 million impressions the past week, with the audience split 62 percent male and 38 percent female — roughly echoing the revenue ratios." . Through the power of the social media, Vetements from a new brand become one of the famous brand in this year, social media helped Vetements to attach the customers and create a new trend sucessfully.

By time to time, the affect of social media become stronger, even the politic decision. Umbrella revolution, happened in Hong Kong, it is a good example to show how powerful of social media to effect the decision of government. "Tens of thousands of Hong Kong residents – young and old, rich and poor – have peacefully occupied major thoroughfares across the city, shuttering businesses and bringing traffic to a halt. They claim that Beijing reneged on an agreement to grant them open elections by 2017, and demand “true universal suffrage”. Organisers said on Monday that the protest would not end until Beijing changes its electoral guidelines and Leung Chun-Ying, the city’s pro-Beijing chief executive, steps down. Neither side seems prepared to back off, and nobody knows how the standoff will end." Through the social media, people know more about the politic decision, and try to share their own opinion on social media. At the beginning, Umbrella revolution is not that many participators, because of the social media, the protestors share messages on the social media, more and more people attend in to it.