A great tool, and often free one at first, it HootSuite. It's been a year since I've used it but it's pretty great. I think it limits you to three social media accounts when using it for free. Essentially you can schedule tweets, status updates, or share content on all social media platforms simultaneously. It's a wee bit confusing to understand at first but tutorials solve that. It's often a go-to app for social media professionals.
"Just call me Bruce Wayne. I'd rather be Batman."