On their site they claim 'Diaspora* is already in the top 2% of all open source projects ever.'
Kind of curious where they got these stats: All of the BSDs, the Linux kernel, all of the GNU project (gcc, GNOME, coreutils...), X11, Vim, Valgrind, LLVM, the list goes on of open source projects I think are slightly more popular.
Then again, if the number of projects is in the millions, the top 2% would place it in the top 20,000...