How Many Friends Can You Have?

Is there a limit to the number of relationships we can maintain? And could that be changing with our ever-expanding online social networks?
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References:
Hill, R. A., & Dunbar, R. I. (2003). Social network size in humans. Human nature, 14(1), 53-72. http://courses.washington.edu/ccab/Hi...
Dunbar, R. I. (1998). The social brain hypothesis. brain, 9(10), 178-190. http://psych.colorado.edu/~tito/sp03/...
Dunbar, R. I. (1995). Neocortex size and group size in primates: a test of the hypothesis. Journal of Human Evolution, 28(3), 287-296. http://www.uvm.edu/~pdodds/files/pape...
Dunbar, R. I. M. (2012). Social cognition on the Internet: testing constraints on social network size. Philosophical Transactions of the Royal Society B: Biological Sciences, 367(1599), 2192-2201. http://rstb.royalsocietypublishing.or...

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