This is horrible advice. I always send thank you notes. I sent thank you notes to every interviewer I've met at every callback. And they have ALWAYS resulted in offers, and the people have ALWAYS complimented me on the nice notes I send.And these aren't at the supposed 'small firms'. These were Wilmer Hale, Kirkland and Ellis, Proskauer Rose, Mintz Levin.Send the notes, its a great idea. Take it from my ACTUAL experiences.