I recently proposed the implementation of AbuseFilter and Captcha extensions on Turkish Wikipedia, and got the full (100%) support of the community.
Here is the link to the discussion:
In this discussion I talked about the extensions in general, and provided examples of effects on other wikis (Captcha on pt.wiki and AbuseFilter on en.wiki).
Here is a rough translation of the page with Google Translate (see "Recent developments, new proposals", but don't count on the tool to understand it as the translation is quite terrible):
Captcha insertion will be required for anonymous and newly registered users (in another words, autoconfirmed users will be exempt), and AbuseFilter will be installed with its standard settings.
I hereby request the installation of these two extensions, and thank you in advance on behalf of the Turkish Wikipedia community.