The problem is easily fixed, however, it's the culture that lead to the problem that needs to be addressed.
Buzz was tested extensively, just not as extensively as other products. I think it is possible to be 99.9% certain that the privacy issues were raised in feedback but were ignored. In other words, this was not a cock-up, it was an appalling lack of judgement.
The only way to avoid repeated "bad judgements" is to fire the culprits. If managers know that they risk being fired if they take bad decisions, they will be more careful. My guess is that, in this instance, someone very near the top needs to get the boot.