Recently polymath projects seems to have stopped.
One reason for this could be that running such a project requires a lot of effort from at least one person running it.
I was thinking if it were possible to run a sort of polymath project solely on mathoverflow, i.e., without any central blog-comment form, just asking questions, giving as motivation links to the other relevant questions.
Also at the end of each important question there could be some links to possible running approaches, but every question would be maintained by the person who has asked it.
This decentralized structure would be a bit similar to what Gowers proposed for [polymath9][1], but imho using [TiddlySpace][2] was not the best choice, as although it might be a great platform, it takes time to learn and not many people might be willing to put in the effort.
On the other hand, mathoverflow is already used by many, and not only those would see the questions who are actively committed to participate, so it really has the potential to grow into a polymath with many participants.
Note that for [polymath3][3] and [polymath5][4] there have been questions asked here, some quite successfully.

What do you think?


  [1]: https://gowers.wordpress.com/category/polymath9/
  [2]: http://tiddlyspace.com/
  [3]: http://mathoverflow.net/questions/tagged/polymath3
  [4]: http://mathoverflow.net/questions/tagged/polymath5