After I interview at the college, who should I all send thank you notes to? To the school in general or one to each of the interviewers? Thank you in advance for your help.
Second, it's pretty pointless, as interviewers don't even have access to your file after the interview date.
Do what you want to - it's not likely to impact your application, and I highly doubt the majority of people send them. Either way, I doubt you will be judged (negatively or positively) based upon whether you send a thank you.
Sure, do what you want to do--but the OP was asking who they "should" send thank-you notes to. In which case, the answer would be "send them to whomever you want to."
I think the above is good information to keep in mind if affecting their application was the OP's original intent. Also good to keep in mind for those who were interviewed a while ago and are now freaking out because they didn't send thank-you notes, or those who have already been rejected/wait-listed and might be reading this thread and be scared if they had sent a thank-you, they might have had a positive impact on their application.
When I was an applicant, I too was on the fence about thank-you notes. Now that I'm in school and know a couple of interviewres personally, I understand why they're not generally recommended.
Firstly, there's exactly the point about volume that WhtstheFrequency brought up. Second, it's pretty pointless, as interviewers don't even have access to your file after the interview date.
could be different at some schools, but I highly doubt it--or at least highly doubt they have access to your file 3-10 business days afterwards.