Not just Ashley Madison. Okcupid. Tinder. Grindr. That group sex site that was just mentioned on HN [1]. Any dating site that is laissez faire about their data and API access (ie all of them) is a trove of information for building a dataset of morally flexible individuals (when correlated against public records).

[1] https://news.ycombinator.com/item?id=20650069

None of those other sites are even similar to Ashley Madison. There is nothing morally wrong with dating using apps or being gay. But I expect most people to agree that cheating is definitely not morally clear.

In fact, the latter ones are so ubiquitous, I think you would be hard-pressed to find a person in a major US city in their 20s who was single for a period of time in the past 5 years and haven't used one of those apps.

The apps alone are not the signal. The app data combined with other data sources is the signal. It can demonstrate intent.

Intent to what? Date?

Tinder? I’ve never used it but it’s used by a lot of people I know for legitimate dating.

Tinder profile + public marriage record = possible hit. I know married folk who use Tinder (some ethically non-monogamous, some not so ethically), so some human review in your workflow would be required.

From previous experience consuming public record data sources programmatically, a proof of concept would take no more than a full day of work. I am not suggesting one do this, only that pandora's box is already open.