[kogir]

The invitation UI showed a list of all your contacts, and let you select which ones to invite. It was pretty clear you could invite more than one person at a time, so our testing never caught going to the screen multiple times in one app run to invite multiple people.

Also, the person sending the invitations didn't see the bad behavior. On the receiving end, when I got multiple SMSs, how was I to know if QA invited me once or multiple times?

We did change our SMS testing process after that though, and haven't had any more similar incidents to date.

You can't catch everything or you never release. It wasn't an obvious bug until we heard about the behavior users were seeing. Sometimes the things you miss have a small impact. Other times they're a bigger deal.