Many things may be at play here:
Over 8000 med school graduates didn't match this year. There are many people that matched into the programs way down on their list. Have at least 2 or 3 specialties applied to and interviewed with and make the most sense if derm doesn't work out.
As you know, the minute you enter this career, no matter what, you'll always be wrong. It gets much better after residency, though. Anything you have that can be perceived as a negative can be extrapolated into making the admission director's life easier by them being able to throw your app in the trash quickly.
This means that they may wonder how much time a person is on social media, if they would actually be able to put up with somebody like that for up to half a decade, and that you won't be able to be human/humane to a patient if you're freaked out by an interview setting where you know that you are being watched every second you're there. Get in a small group of friends/mentors and practice speaking about things, then make it a bigger and bigger group until you're able to deal with all kinds of people without issue. This may best prepare you for the PD looking up from your app and saying "WFT are you doing in my office?"
It's funny how often I've seen attendings finish an interview and FBI the heck out of the applicant when they get back to their office. The sites that usually allow people to find anyone else are usually the easiest to look into. Facebook, IG, Twitter, etc. At least hide all of your social media presence during MS4 and don't reactivate anything until after the contract is signed and sent back. One should have plenty of reasons to actually delete those types of accounts with all of the breaches going on, IMHO.
Best of luck for all of you, hang in there and remember that your personality and team attitude is one of the main things they're trying to tease out from the interview day.