The "youtu.be" links do not embed into the posts. Those are abbreviated YouTube links. To embed the video, click on the abbreviated link you posted above. It will open up a new tab/window to the YouTube website. Then copy that address to get the full YouTube URL. For the video you posted the full URL is:
Video embedding works on all browsers. Make sure you are posting the full YouTube.com URL (not the abbreviated youtu.be short link).I didn't want to start a whole new thread but do the Mods think it would be possible to make this site's automatic video embedding compatible with Safari?