Google search on Pittsburgh ATM yeilds 131 results (sorted by date) at the moment...22 hours after intial reports. (Many of those are since the confiramtion of the hoax).
Let's see how many stories there are in another 10 hours.
Update: Google Pittsburgh ATM Sorted by date with duplicates included:
1160 hits, with 400-450 before the hoax unraveled.
That is 400-450 before (over a 20ish hour period) and 710-760 since (over a 3ish hour period).