16.5 Social Network Evolution
For many people, life on the Web involves heavy use of social networks to stay in touch with friends, family members, colleagues, and people they don’t know personally but want to “follow.” A social network is an online service or website designed to allow people with shared interests to interact. The functionality provided by a social network facilitates communication in order to share ideas, events, and interests.
Today, some of the most popular social networks include Facebook, Twitter, LinkedIn, Pinterest, Tumblr, and Instagram, though there are many others. Facebook currently has more than 1.2 billion members. Twitter, the second most popular site, has 255 million members.
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