To the applicants here.
I'm using YouTube stats as a metric whether or not our application was read.
We have 5 videos in the application:
1 team video that was watched by someone from YC;
3 videos about teams' past work - only one was watched from California in the last 10 days, and we can't be sure it's someone from YC because it's a public video;
1 video showing the proof of concept of our product - not watched.
So, I'm guessing this is a bad sign for our application? :)