Point 63

The "Strong Tie" Group Size 

An average person has a strong social relationship with about 150 people, realistically varying from 100 - 230 people.A strong relationship is defined by:  Everyone living in a close proximity to each other Everyone knowing personal information about individuals in the group Everyone understanding how the group feels about each other Social media allows people to expand their social group, but the relationship between users is considered a "weak tie" since you can interact with strangers or acquaintances that you may not live near or know that well

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Understanding the relationship among your users, will help set expectations for your design. Knowing if the ties are strong or weak affects the communication and functionality aspects of the design. 

Insight