In article 1369242450.63126.YahooMailNeo@web172605.mail.ir2.yahoo.com, halz halz_antispam@yahoo.co.uk writes:
If you've ever set up a fresh MediaWiki and tried to leave it open to editing, you'll know about the problem of wiki spam. There's various well documented tricks to tackle the problem on your own wiki (although it seems to me that some of these are becoming less effective over time. Particularly reCaptcha)
I thought the standard practice was to require admin approval of new accounts and require new accounts to fill out a profile for their user page.
Is your problem that you want to open your wiki to a broader base of people that you don't want to personally vett the users, I'm not sure how to deal with that.