I am interested in the Bacon Number for Stack Exchange sites, based on migrated questions.
For example, I suspect that there will be a lot of migration between Stack Overflow and SuperUser, or Pets and Biology; but perhaps not so much between WorldBuilding and CodeReview. It would be interesting to see a graph or chart of migrations over the past (say) year, which could be used to build "degrees of separation" between the sites.
It would also be interesting to see if that matched up with the numbers of users who are members of those pairs of sites.
Hopefully this request is on-topic here