My friend Geoff Dutton just finished describing our analysis of Cowbird, an online community of storytellers, envisioned as an anti-Facebook by Jonathan Harris of wefeelfine fame.
We basically found that this is an intrinsically motivated group of writers, who use writing as a therapy for soothing the soul. It is a close-knit community, with writers doubling up as readers of the stories of others, which they can "love". It seems that writing on cowbird is done mostly for being "loved". Somewhat worryingly for cowbird, the average number of loves per story seems to be doing down, as is the overall positivity and emotionality of the stories.
Here is Geoff's story about cowbird on cowbird.