Having multiple social media accounts will help you promote yourself, and your content. If you are just using one service you are missing out on a lot of people that might be interested in your content. Using multiple social media services will also help you find more information that you can share again on another social media service and therefore use social media correctly. It is very important that you share others content and using multiple services will help you find content worth sharing. It will also get more people to share your content and get you a larger following. So if you are only using one service, broaden your horizon and get started on multiple. You know what they say, the more the merrier.