Is this a HIPAA violation?

I know someone that has been taking pictures and posting on social media of patients he's observed surgeries on. I did confront him once about it and that person said the patient signed a waiver allowing documentation such as pictures (this is an academic institution). I don't believe that this allows pictures of sedated patients or pics of aborted fetus to end up on social media (yes this actually happened). I actually know this person very well and don't want it to get traced back to me,... Is this a HIPAA violation?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums