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pump.io is a stream server that does most of what people really want from a social network. You post anything and my followers see it. It is an alternative to twitter. You can post almost anything that can be represented with activity streams -- short or long text, bookmarks, images, video, audio, events, geo checkins. You can follow friends, create lists of people, and so on.
GNU social is a free social networking
platform and it is a continuation of the StatusNet project. It helps people in a community, company or group to exchange short status updates, do polls, announce events, or other social activities (and you can add more!). Users can choose which people to "follow" and receive only their friends' or colleagues' status messages. It provides a similar service to proprietary social network sites, but is much more awesome.
Hubzilla is a general purpose communication server integrated with a web publishing system and a decentralised permission system. If this sounds like a bunch of technical mumbo-jumbo to you, just think of it as an independent platform for sharing stuff online (publicly or privately). Hubzilla contains some social network bits, some cloud storage bits, some blog and forum bits, and some content management bits. These are all integrated within a common privacy framework - and it is all decentralised.