In my app at seaofpo.vispo.com, I have a static Facebook preview image via a meta tag in the head of property="og:image". But, typically, the URL is dynamic, such as https://seaofpo.vispo.com?p=ja or https://seaofpo.vispo.com?p=mp , which displays something different. I would like to be able to post on Facebook URLs such as the latter ones, and have the preview image draw from what appears on the screen in those cases.