I have developed a peer to peer social network called MyZone. it is designed to be secure and resilient towards cyber attacks specially DDoS attacks. The way it works is pretty much like bittorrent. It supports almost all the features that are provided on Facebook and Google+ in addition you can share unlimited mp3s and mp4s. You can find more information about it at joinmyzone.com where there is also a video demo of how it works and its features. I hope you give it a try.