I've NOT seen any SM scheduler strategize/planning tool. A lot of content is repurposed from blogs/emails, so I have a worksheet that plans out my quarterly content and directs my team to the content so they can break it up for SM.   I also dump my draft captions in there. There is a lot of collaboration that goes into SM before posting, but no tool to help you do it in one place. It would be great to have a team posting planner and a caption library built into Zoho Social.