Dating was an early form of social networking. However, now you can get to know someone without even meeting them. You can learn
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their likes and dislikes, even how they even spend their day.
Twitter and Facebook, two commonly used programs, allow people to have and share an experience. When these programs were first put together, they were to keep up with friends' current daily occurrences. It turned out that even strangers could be drawn in and share their own pieces of their life as well. This was a "surprise" to even the inventors of the programs. Are people nosy, or curious, or enthralled? Collectively, the experiences shared from reviewing a book, or movie, or restaurant can influence others in a personal way that is not expected.
See Also: Social Networking: Balancing Business Benefits Against Business Risks
Image Credit: Wikimedia, Social Networking by Koreshky