Thank you for sharing this article providing history and details about cartography and their handling as public good.

Also, I have a question: how do you share posts from Diaspora* to pump.io, and probably the reverse ? I am interested in that :)

I could didn't see anything like that there as pointed by JanKusanagi , but I may not have looked deeply enough: http://pumpio.readthedocs.org/en/latest/clients.html