Before it's deleted, you'll note that there's an Android post one or two behind mine, but far from being my inspiration, it's yet the umpteenth incorrectly placed post that has landed on Meta.
This question is not a request to change the "signage" around town in an attempt to thwart these from landing here in the first place (as I think that has been examined to death already).
The issue at hand here is what should we tell these posters? A few good Samaritans have taken the time to tell those asking questions meant for Stack Overflow that their post is off-topic here, and that they should post on Stack Overflow, etc. Common sense would dictate that this would be a reasonable approach. However, I tried that for some time, but maybe only once ever did someone reply back and say "Oh, my mistake". Lately, I have avoided leaving any comments because no one ever replies or asks for clarification.
So, as citizens of Stack Exchange and Meta Stack Overflow, what is our burden and due diligence?
(already noted in the prior discussions was that the intent of some of these "misplacements" is to skirt a question ban on Stack Overflow by posting here and mistakenly thinking the question would be moderated to safety, so obviously, any feedback placed on these questions should, without saying, discourage these attempts)