I found this to be very useful and gave me a good overview of my presence on social media networks across the web. Helped me to realize next steps and hopefully for you too:

“These seven services search the availability of your username on multiple sites at the same time, and many also offer the option to create your profile on each of the sites they search for a fee. If you’re aiming to unify your personal or brand presence across the web, these handy tools are worth a look….” Read more