Do you drive by their home before hiring them? Maybe peek through the windows? Obviously you can’t ask for a key to their house, that would be insane and abusive. But anything you can see from the street is fair game, right?

If I thought that such public information would yield information useful to a hiring decision, relative to the time and resources required to obtain that information, then yes.

The exterior of someone's house isn't useful in hiring. Their thoughts and opinions they choose to publish to the billions on the internet generally are.

I'd say you could learn almost as much about a person by looking at their house as by looking at their profile on the internet (that is until they learn that you will check their house. Once something gets measured it stops being a good way to measure or something like that)

Edit: and I kind of agree with the others.