Here is a video that I prepared back in 2011. It is still relevant, and this is still a question that I answer to this day.
Where can I get my content from for social media? There are a lot of new methods including the tools like Hootsuite, Buffer, SproutSocial and Viral Heat. These are tools that can help you to creat content for your audience. There are other options too, like hiring content creating copy-writers. Or even using tools like UpWork or Fiverr to hire them there. These are all great options, but if they are not what you are thinking about (because none of them would be uniquely your "voice") then here is a simple solution that you can employ today.
If you have any questions please email me at firstname.lastname@example.org