Formality or Not?

[Danica]

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Every interviewer says either "contact me if you have any other questions" or "keep in touch".

Is this just a polite formality or do they expect us to actually contact them?
If they do, what are they waiting / wanting to hear?

 

[Doc Samson]

Every interviewer says either "contact me if you have any other questions" or "keep in touch".

Is this just a polite formality or do they expect us to actually contact them?
If they do, what are they waiting / wanting to hear?

It's a formality, but feel free to contact them if you do actually have any questions.