QUOTE(Kelly Martin @ Sun 19th September 2010, 1:28pm)
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Yes, the conclusion is that people contribute to social media sites because they want attention. This is the motivation of a significant fraction of Wikipedia's editor base, probably either first or second most common, along with the "so that the truth can be known" motivation of those forwarding their personal ideologies.
Critical mass drives both of these motivations: people who want attention aren't going to go somewhere to get it if there's nobody there to notice, and people seeking to spread the truth gain nothing from shouting in an empty room.
Wanting attention isn't too bad a motive. When I'm asked to speak at a conference, I usually inquire as to the numbers and "quality" of the participants. I'm not so keen to speak if there answer is "not many and not much". OTOH, if I were asked to present to a room of professors I'm hardly likely to refuse.
Why on earth would anyone want to contribute to anything which has no audience and no feedback?
I wonder though that Wikipedia has a real problem. A lot of people contribute reasonable stuff, or do useful things, for a social networking payback. Five years ago, there was nothing (except specialist sites) to compete with Wikipedia for social networking among the educated and post-teenage user. Now most of these people are on Facebook - which has a much more attractive modern interface (and the resources to develop it) - while the wiki looks tired.
I fear that, over time, Wikipedia will lose out as social networking interfaces evolve and Wikipedia is stuck with low resourced devs and a very conservative community and so will not keep up.
The other problem is that as the userbase slowly decreases, Wikipedia has the dilemma of either seeing articles deteriorate, or locking more and more of them, since a decreasing userbase can't maintain a still increasing database. If they lock more articles (as they are doing) this will hasten the decline. It isn't so attractive to become a wikipedian if high-profile articles are locked, and others are seen as so "finished" that your contributions are reverted.
Note the fact that there are moves to semi-protect all Feature Articles, and articles like "Climate Change" have been semi-protected for months. This would not have happened two years ago.