Apple folks were so kind as to share the following dynamic ad:
Number live as of NOW at WPSE, UTC 2013-11-24 at 1:33
Yes, just go to any Stack Exchange site, open any post and paste the following as an Answer:
[![Our currently active bounties]] : http://stack-exchange-dynamic-ads.herokuapp.com/bounty.png "Our currently active bounties" : http://CURRENT-SITE.stackexchange.com/questions?sort=featured
It will render the current bounties in the current site.
I tried to propose this at our Community Promotion Ads - 2013, but