Thanks for the pointer to the XML data dumps, @Charles Stewart. I used the June 2013 data dump (formerly here: http://www.clearbits.net/torrents/2141-jun-2013) and extracted the tex.se portion into a MongoDB database instance for easy querying. The dataset consisted of over 103K Post records and 27K User records. Every post has a type associated with it. ...
I don't think the Data Explorer (data.stackexchange.com) will help: you need the fixpoint of an operation over the graph and I don't think the query language supports that.
There are other options:
There is an API to query this content - https://stackapps.com/ - though hammering the API with recursive queries might get you in trouble, and
The whole ...
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The following query could be a starting point:
Please note that it returns a few "false positives", i.e. answers by other users, but maybe it is good to leave them in so that these posts can be fixed as well.
I just learned that there is a url key for the search