As a person that spends a bunch of time using social media daily for work and play, and has seen it all, I can assure you that your true personality will come out eventually if you are even moderately active on social media.
Social media is really more transparent than some people may realize. It is just too difficult to mask your opinions, interests and tendencies when you have such quick and easy access to direct communication tools.
Here is a fun little infographic from mylife.com that explores the most commonly found social media personality types. Where do you fit in?
Image Credit: RLHyde