Do you post on Facebook, Instagram or Twitter? If so, then you're creating content for those sites. For free. They make ad dollars while you get validation via likes. This link says it a lot better than I can.

This site is an effort to make sure that all the content I create for various platforms is pushed from here to them. That way, I have everything I write and create in one place. The big social media platforms are not the only repositories for it.