PHP Social Network Script without DB

Social networks put plenty of websites out of commission - anyone can create a group on Facebook, and it's much easier than to build and support whole website. We want to get web-masters back into the game - with GRA4 anyone can get it's own full-blown social network. You are looking on the simplest GRA4 type - Micro. It can run on any PHP hosting (even free one), and does not require database server.