Right now (May 4th '12 20:58 UTC), the main page either remains as I first opened it or continues to 'update' with tens of questions each second coming to the top of the list. Once I refresh, it's gone and everything is back to how it was when I first opened it; a minute later and the same behavior shows.
Update:
The posts that come up are very old (mostly dated between May '11 and Nov. '11) if that helps...
It only happens when I stay on the main page.
javascript:setInterval(function(){$('.new-post-activity').click()},10)
in a bookmarklet/browser URL bar. Make the 10 into a one if you want it the fastest. 10 means that it checks for and clicks(if the new post thingy is present) the new post thingy every ten milliseconds. $\endgroup$