Quite simply, no. But if it was notifications they were probably going through 'Chubby' [1] which is sometimes used as a scratchpad for notifications. But if you read the interview with Sean Quinlan [2] you can get a sense that 60TB is quite small.

[1] http://labs.google.com/papers/chubby.html

[2] http://queue.acm.org/detail.cfm?id=1594206