> As a society, are we rallying behind an app that helps people engage in extramarital affairs as this post suggests? Without getting into morality, don't we agree that affairs impact not just the two participants but the families surrounding them?

I think that line of reasoning is projecting far too much onto a photo sharing service. I use it to share silly photos with friends. Just because someone else uses it to conduct an extramarital affair doesn't make the service per se immoral.