For example, if someone didn't know what a tamagotchi was, they could ask:
Identify this game device:
1) had a digital pet
2) old, small device
3) can hand in keychain
4) japan item
Where would I ask these types of questions?
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The problem with showing an image, and expecting people to identify it is it is really hard to find that question, and its horribly localized.
Personally I'd ask about such things in chat knowing the chat has people interested in such things.
QA is typically bad for this and quite a few sites discourage this. On SU for example, we've been trying to get rid of hardware ID questions by semi-rolling them into a generic hardware ID question.
This is also made a little more complex by a certain oddness of scope since there's no real site that those random electronic tchotchkes are on topic.