You want to make your social media account as secure as possible because if you do not do this, then people may easily access your account. They may get personal information from you and so much more. You need to make your password as secure as possible so that you can add both lowercase and uppercase letters, numbers, and even symbols if it would be allowed.
Some websites do not allow the use of logos. You will probably be informed about this when you are creating your password. One thing that you have to remember is never to forget what your password is so you can access your account easily anytime.