Along with the potential HIPPA violations, This is how patients and their family members end up finding you on social media or public records search. Then they start asking you medical questions and about their conditions, which is all HIPPA protected and requires a signed release to discuss and under what circumstances etc. I am all about my patient when they are in my care, but that relationship stops the second they are discharged or transferred, unless follow-up care/calls are part of the job description. Patients are in a vulnerable state and may make inappropriate assumptions about your "personal note".
I want to leave my job at work when I go home, not bring it home with me via social media or some kind of ongoing interaction with patients that can jeopardize my license.