Excellent topic. One that is not covered enough on this platform IMO. This is an area I too have some experience in. There are people who actually do this for a living. My late partner, @samrisso hired a few people to manage several social media accounts for him. The content was his, but he didn't have time to do it all while also running several businesses, so he outsourced the graphic design and copywriting. I actually use the same graphic designer he did to do my hive blog and all my social media these days, but I do all the writing myself.
RE: Managing Social Media for someone else - My Experience