Wikipedia Task Force: Reader Conversion
I have been selected to participate in the Wikipedia task force to increase contributions from readers and under-represented groups. In other words, to convert wikipedia readers to editors.
I have posted a few of my pet theories as to why people are discouraged from or disinterested in editing wikipedia on my wikipedia strategic planning user page. I welcome discussion there or here about why you or people you know choose not to edit wikipedia.
I have posted a few of my pet theories as to why people are discouraged from or disinterested in editing wikipedia on my wikipedia strategic planning user page. I welcome discussion there or here about why you or people you know choose not to edit wikipedia.

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As others have mentioned, the interfaces, both technical and social, are not of the friendliest.
A couple of examples:
At a very basic level, if one clicks on the link to edit a Wikipedia article, one is usually confronted with a mass of wiki mark-up. for the uninitiated, this, in itself, is sufficiently daunting to have a good chance of scaring one away. The same applies to discussion. In addition, for discussion pages, one must understand that the discussion page is a wiki, itself. This is not necessarily obvious even to someone who already uses the web; it is not the usual interface for providing content.
I have not contributed to Wikipedia at all, even to fix obvious typos. I have read quite a few history and discussion pages for Wikipedia articles. Much there often seems to be expressed in such a way as to lead me to doubt intent toward cooperation.
Interesting that you should be bringing this up today. It was only a Tuesday that I became curious about what hacking might be happening using Wikipedia. I searched on just those terms and came up with a bunch of articles such as this: http://www.seomoz.org/blog/the-dark-side-of-wikipedia. It seems that there is a certain justifiable paranoia, though that is no excuse for unpleasantness as a policy or even as a common response when dealing with newbies.
I will, however, plug another on-line, volunteer cause: Distributed Proofreaders (www.pgdp.net). I did a bunch of work for them early on (about 2000-2001). It's fun nit-picking, if you like that sort of stuff and I think that the cause is good. I should really get back to doing more of that.
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(The templates and such are used for a reason, and they're a pretty decent mechanism for what they do, so I don't have a really good solution here. Maybe better tutorials? Or more loud assurances that mucking that stuff up a little bit isn't that serious a thing.)
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There are a number of things it might be good to show in a "so this is your first time editing?" message.