<p>I agree with the general sentiment here. My son sent thank you notes or e-mails to interviewers (whether admissions officers or alumni) as common courtesy. As an alumni interviewer myself (for over 10 years), and one who devotes a fair amount of my time to interview students, I know I would have appreciated the sentiment. I have never received a thank you note from an applicant that I interviewed. It wouldn’t have helped in the admissions decision; it’s just good manners. At least I’ve instilled that in my son. And I also hate the M&Ms idea. That is not a “thank you,” it’s a gimmick.</p>