I recall reading an article about the number of friends, and it was between 50 and 150 that one can really have, psychologically that is, I can see if I can dig up the article for you if you like?
P.S. And that's the article you referred to; very interesting, not read it before (although IMHO, the author could've done better without using the 4-letter words...)
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(No, no, I get the point.)
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Would say more, being paged!
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Here's another one for you then:
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http://en.wikipedia.org/wiki/Dunbar%27s_number
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http://www.cracked.com/article_14990_what-monkeysphere.html