25 years ago I wrote to an ad in a flying magazine for a list of contacts in the aviation industry - probably a precursor of today's job websites. I sent out over 150 resumes to every corner of the country (including Alaska!). I'd say well over 100 came back marked as 'Undeliverable' by the post office, never heard back from a majority of those left and was well short of the minimums of one of the few that actually responded back. I have no faith in such advertising.