I'll have a closer look at the site-dead implementation. This should not be triggered by content filtering.
Feel free to steal the code.
Certainly. This is why we have a permissions system.
If you've got 100 connections and send 1 post and receive 10 likes, your site will have processed up to 1000 queued messages as it shares those likes (comments, etc) with the rest of your connections. It all adds up pretty fast.