If it wasn't exploited makes it even better...shows that you are being aggressive in identifying issues and applying corrections. Take advantage of opportunities to show transparency in a good light as well as meet your commitments to be transparent when events have not gone your way. This shouldn't be about how many reports you have to issue. Google can afford the staff to make that happen.
That's probably not how end users would see it though. If there was a report every other day that google or facebook found and fixed a security bug people would either ignore it or trust another company that wasn't as open much more.
