Friendica is also the most technically advanced and feature-rich decentralised Facebook alternative currently available for the indie web. Friendica doesn't require that you use any other services for social communication. We provide fully distributed communications protocols ("DFRN" and "Zot!") for securely sharing with your friends across the internet. These have all the privacy and communication features you expect, military-grade message encryption, and more. This network is infinitely scalable, and nobody can ever own it. They're your photos. Your posts - to be shared with who you wish and only with those you wish.
Friendica is decentralised, open source, secure, private, modular, extensible, unincorporated, and federated.
Oh, and Friendica is free. Free as in beer, free as in freedom, free as in "no strings attached", free as in - well, free.