You can wear one thing one day and go the other end of the spectrum the other day. There are no rules and such, so long as you're comfortable and you have fun and are yourself.
I actually don't prepare for onscreen nudity. I really believe that you have to be comfortable with your own body and unless the role is directed to a certain physicality and you're playing a sports person, then obviously you've got to train for it, but I just try and do things that make me happy and comfortable in my own skin, so I've gotten into yoga quite a lot.
I don't have any social media. I'm pretty clueless, but I guess I did it would probably be something around food.