As PM for this project I can say it's super exciting. The team is awesomely sharp, the architecture is super impressive, and this is by far the most exciting performance monitoring and feedback system I've been involved on surpassing the work I've been involved in on Oracle's performance monitoring and tuning system and Embarcadero's DB Optimizer and Quest Foglight and Spotlight.
Putting together a social network schema and keeping performance in check is less than evident. It's a problem that many have to tackle such as facebook, twitter, linkedin, flickr etc. Here is a blog article discussing some of the issues and approaches: http://www.kylehailey.com/facebook-schema-and-peformance/
