Of the last 40 updates I’ve made to my Facebook Application for showing Stock Quotes, 6 have failed with a “Unknown data store API error.” While I have no idea what the error means, it seems to indicate that Facebook couldn’t save the data I sent it at a 15% rate for that period of 10 hours.

Other Facebook Platform issues include restricted growth, bugs in the developer application, downtime, and poor performance. Obviously, F8 will go through some growing pains before it fully matures.