When designing an online social network it is important to consider whether this is likely to result in the creation of a ‘new network’, or reflects existing real world contacts.
In the 1990s, Dunbar proposed a neurocognitive limit on the number of people that a person can have in their social network of around 150 stable relationships. Research on undergraduate use of Facebook found that although the median number of contacts in the sample was 300 Facebook friends, the actual number of people participants considered friends was around 75. Recently Dunbar (2015) found that the number of online friends in a Facebook network that are actual friends is similar to that of friendships. (Parsons 2017).
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