Just a notice for others:
I have "Minimum number of tags: 2" set under >admin >posting
I got a posting which showed only 1 tag.
I checked mysql and there were 2 tags listed, ahhh, right the guy used a swearword that I listed under "Censored words" (also >admin >posting).
Spam control even hides spam words from tags. Professional, gidgreen, you thought of that!