Thanks to Frédéric Peters, I’ve discovered that Gnome is using DOAP to describe projects in its Git.
At http://git.gnome.org/repositories.doap, one will find the complete agregated DOAP and FOAF description for the projects of Gnome and their maintainers.
My collegue Vu, who’s researching on such social networks has graphed the following image :
which shows projects in red, and their maintainers in green.
More analysis later maybe, but the image is already nice in its own 
Update : a more detailed representation is available (see comments bellow).
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Love this, can’t wait for a more detailed version. Having fun in #gnome-hackers trying to guess who’s who.
Here’s a followup with a more detailed image, with names :
https://picoforge.int-evry.fr/cgi-bin/twiki/view/Pftcr/Web/GnomeProjectMaintainersVisualization