Most of the edits in this wiki are spam.
There are many features and plugins for mediawiki, for blocking spam. The most important ones are described on the following links:
As a first step I'd recommend adding a CAPTCHA when creating an account:
- install ConfirmEdit with $wgCaptchaTriggers['createaccount'] = true (CAPTCHA when creating an account)
- if possible also install the FancyCaptcha addon (to get better CAPTCHAs, because CAPTCHAs from ConfirmEdit are not very strong). Requires python for creating the images when installing.
- one of the best/strongest CAPTCHA solutions is ReCAPTCHA (AFAIK not broken yet, it uses words from books which OCR software does not understand - learn more). There is a ReCAPTCHA extension for mediawiki, which is based on ConfirmEdit. It does not require python or something like that.
The basic ConfirmEdit uses very simple CAPTCHAs which are not very difficult to break. So if any spambot is able to work around it, it's probably a good idea to use FancyCaptcha or ReCAPTCHA.
Since spammers use the same accounts for spamming every few days, it's very important to block/ban/remove the accounts known to be used by spammers. For an example have a look at the contributions of the user which posted spam I reverted last: http://wiki.awkwardtv.org/wiki/Special:Contributions/KqkYhs
If this does not help: