Favoritism is not the same thing as discrimination. Workplace favoritism can refer to when an individual or group appear to be treated better and not necessarily due to superior work performance. Favoritism in the workplace can result in a person being promoted faster than others, being paid more, or given more leeway.
Before you go public about your complaint, it is important to examine the consequences. If the workplace favoritism is holding you back and you feel it is based on illegal reasons, such as race, sex or age, you may consider legal action. It is important in this case to have evidence of a wrongdoing. Also examine if your job is worth fighting for and if you want to work somewhere that tolerates favoritism.