On Extropia there is no central authority. The organization with the strongest claim, Extropy Now, exists to provide a haven for libertarians and anarcho-capitalists, and therefore avoids exercising any of its power. Large and complex markets have arisen, providing legal systems, security, arbitration and adjudication as paid services. Even with the advice of muses, expert systems and AIs, however, the potential interactions between these services can be inconvenient and unpredictable.
Like attracts like for both comfort and convenience. The interactions of competing legal systems, security contractors and private magistrates can become a headache for all involved. It is easiest to interact with those who share your expectations, and with whom you share a common adjudicator. Extropians are steadily conglomerating into sub-societies of shared legal systems, security arrangements and acceptance of arbitration: consensus societies.
The largest and most prominent examples of consensus societies are the Caliphate and the Commons. The Caliphate is ostensibly Extropian and autonomist friendly and the Caliph has deliberately downplayed formal authority: they use the open source legal system OpenSharia, and maintain no military or police system, being instead safeguarded by volunteer militia.
The Commons is populated primarily by refugees from commonwealth nations. They have created a legal system based primarily on the traditions of English common law, adjudicated by a hierarchy of elected judges, and enforced by volunteer police.
Plot Hook: Extropy Now, owners of Extropia, have become concerned with consensus societies, fearing that they will grow into states. They are looking for discrete social engineers, memeticists and hackers to non-violently undermine and collapse the Caliphate and the Commons.