Via PostSpeaker you share a link and that can also be a link to a video on a website, YouTube, Vimeo or Facebook. Use the link of the relevant web page or the video url.
As you may know, Facebook only plays videos that have been uploaded to Facebook. To share such a Facebook video, you must first go to your Facebook account. If you go to ‘videos’ in the menu and use the mouse to click on the video and then right-click, you can copy the address and paste it into the message field in PostSpeaker.