You can add information to your broadcast page. As much or as little as you like, it's easy to do and you can change it whenever you like.
First, go to your account and click on a link, such as Email & Security. This will take you to the page shown below. Just click on PROFILE and you will be here:
You can see that there are many ways to add information, such as your age, gender, languages, etc., as well as a place to add a short biography, your interests, and also links to your own social media accounts.
Remember, you can add as much or as little as you like. You are not obliged to put everything in there.
If you add social media links, make sure they are links to your model accounts, not your personal accounts.