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Change in user characteristics?

Posted by MattJHodgkinson on 22 Dec 2011 at 16:03 GMT

the overall time series has shown a gradual downward trend
http://plosone.org/article/info:doi/10.1371/journal.pone.0026752#article1.body1.sec2.sec1.p2

Did the demographics of users of Twitter change over this time? Is it possible that "early adopters" of services such as Twitter happier or more optimistic in their outlook?

Competing interests declared: I am an Associate Editor for PLoS ONE