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Fossil's user base has yet to reach a critical mass, mercurial and git are at least widely used and plugins, and services exist. I wonder if darcs will become a viable option again.

For git there is ticgit, which is a tracker that lives as a git branch.

Its definitely great to have several tools available and see a really productive evolution for good version control systems.

There is no decentralized system yet for social networking:

Identity, Authentication, Privacy, Subscriptions, Notifications, Contacts, Invites etc.

That's what we're working on at Qbix

There's also Trac:

http://trac.edgewall.org