I have no clue why that always shows links to Jokes sites.
Google Ads works by determining the most applicable ads from the content of the page. For some reason it thinks the board page is funny. :-P
pagead2.google.com is the server they gave me. That should be sufficient.
There will be ads on the other pages as well. I'm tailoring them for each layout. Note that only ads that are clicked upon earn money. Merely showing up on the page isn't sufficient.
I don't know how the Twiki works; I would assume that ads can be added permanently to the headers.