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There are many social networking sites, among these some sites like Facebook, WhatsApp, Twitter and Instagram that have become popular platforms over a short period for social interaction across the world [3]. But the options available in these networking sites are limited even though they are popular. There are other social networks, which are having more number of options but not popular. All these social networks are classified based on the options like sharing photos, videos, thoughts of personal or professional which are available for people to interact and collaborate each other. The following categories explain about how each one classified based on available options. Figure 1.1 depicts various social networks available online.

Figure 1.1 Social networks [23].

The major benefit of social networks is keeping in touch with family members and friends. The following list shows the most widely used social networks for building social connections online. Table 1.1 shows users for each network in millions.

Table 1.1 Social network users [24].

Service	Active users (in millions)
Facebook	2,320
YouTube	1,900
WhatsApp	1,600
Facebook Messenger	1,300
WeChat	1,098
Instagram	1,000
QQ	807
Qzone	532
TikTok	500
Sina Wiebo	462
Twitter	330
Reddit	330
Douban	320
LinkedIn	303
Biadu Tieba	300
Skype	300
Snapchat	287
Viber	260
Pinterest	250
Discord	250
LINE	203
Telegram	200

Facebook: Facebook is arguably the most popular social media service, providing users with a way to build relationships and share information with people and organizations that they choose to communicate with online [3].

WhatsApp: It is a real-time social network that arrived later than Facebook but has evolved in a short time by offering user-friendly features such as quick messaging, sharing photos, videos, documents, voice and video calling, group chatting and protection for all these, etc. [3].

Twitter: Share your thoughts and keep ahead of others through this platform of real-time information [3].

YouTube: YouTube is the world’s largest social networking site for video sharing which allows users to upload and share videos, view them, comment on them, and like them. This social network is available throughout the world and even enables users to create a YouTube channel where they can share all of their personal videos to show their friends and followers [3].

Google +: The relatively new entrant to the social interaction marketplace is designed to allow users to establish communication circles with which they can communicate and which are integrated with other Google products [3].

MySpace: Though it initially began as a general social media site, MySpace has evolved to focus on social entertainment, providing a venue for social connections related to movies, music games and more [3].

Snapchat: This is social image messaging platform which allows you to chat with friends using pictures [3].

Interface through social network sites between online users is one of the major common computer-based activities. Facebook is most a dominant platform over a short span of time for social interaction across the world. Even though it stays the largest social networking site, sites like YouTube, Twitter, Google+ and Sina Wiebo all have lively and busy user populations that maintain social interactions in their own ways, with new features springing up all the time. With the help of inventive research methods and theoretical case studies, inventors can better realize how these networks work and measures their influence on various kinds of social interactions as well as the associated risks and benefits. Like sharing information which can be useful to public without hurtling other communities, religions, or political parties, etc. and the other is where people may share abusive photos, videos or sensitive information about country. For more advantages and disadvantages see Ref. [4].