Research from the University of Cambridge Psychometrics Center and Microsoft Research Cambridge:
Simply by delving into volunteers’ Likes, the researchers could determine in 95 percent of cases whether a person was Caucasian or African American and in 88 percent of cases whether the person was heterosexual or homosexual. They could determine whether the person is Christian or Islamic 82 percent of the time…While the results can be seen as hilarious… the privacy implications are alarming. Facebook Likes are public by default.
Facebook has never been big on privacy but this is something else altogether. It seems you are revealing yourself more than you realize.
A different but related issue, never mention patients by name on Facebook without permission and never under any circumstances reveal any medical/dental information.