***** To join INSNA, visit http://www.insna.org ***** There was a paper in a peer-review journal that talks about the "send Christmas card" relation.....I think that they mention the number 152.... Hill, R.A. and R.I.M. Dunbar. 2003. "Social network size in humans." Human Nature 14:53-72. Lynn Smith-Lovin Robert L. Wilson Professor of Arts and Sciences Department of Sociology Duke University 348A SOC/PSYCH Bldg Box 90088 Durham, NC 27708-0088 919-660-5786 Home: 813 Berkeley St Durham NC 27705 919-416-1033 _____________________________________________________________________ SOCNET is a service of INSNA, the professional association for social network researchers (http://www.insna.org). To unsubscribe, send an email message to [log in to unmask] containing the line UNSUBSCRIBE SOCNET in the body of the message.