One you have all of the names in use then start creating icons for your profile. If you are doing it as a person then use a picture of yourself because people will be more likely to follow a person. Do not start any social media activity with the default or empty Icons.If you are a company then brand yourself with your profile pics. Use a large image and size it to the different aspects needed. If you can afford it have a graphic designer get creative with them incorporating it with your logo. Anybody familiar with after effects should be able to achieve greatness with your design.
Here are some images I used for Movie Hive as examples:
|Icon for Social Media Sites|
|Cover image for social sites, modified for each site.|