How do you keep your content clean?

[s010]

I am still working on building up my Pligg-powered site and I have been reading a lot here about spam issues.

My first line of defense is a captcha at registration.
Second line of defense is email validation.
Third line of defense is captcha on submit.

What other methods and strategies you guys employ in your effort of keeping your site clean from spam?

Do you control registrations in any way?
Do you have any other protection mechanisms (similar to captcha)?
Do you control every single submission or rely on visitors to bury articles?

[chuckroast]

Here are a few others

http://forums.pligg.com/pligg-module...or-v-02-a.html

http://forums.pligg.com/pligg-module...er-module.html

Scarecrow v.01 Pligg Module | Templates and Modules for Pligg

Story Admin Email Moderation | Templates and Modules for Pligg

Mods - Blackball for Pligg | Templates and Modules for Pligg

block a country, block by ip address, deny access by country

[s010]

Thanks, chuckroast.

I was also looking for some tips from actual site owners like, for example whether they browse and manually check all publications, or do they have some kind of user control etc.