[aj]

<i>(b) new threads that are neither clearly spammy (banned) nor clearly unspammy (allowed on as now) should be provisionally allowed on the new page, but then banned should a single reader flag it, without the intervention of a moderator</i>

Don't you think that will start flagging wars or egregious flagging without a just cause? I think a score should be maintained by tracking how many users flag an article and based on a combination of Bayesian filtering and user reputation (karma) and perhaps some other factors, the post be killed or let remain.

[mooism2]

Maybe.

I was thinking that if the server marginally decides a thread isn't spam, it should be easier for readers to overrule it, and so classifying threads into 3 threads is better than into 2.

I think your idea is better.