see when we post a link(from youtube, facebook) it is not showing any preview, it just showing the link. I pasted a link here - https://www.youtube.com/watch?v=WYYvHb03Eog see it just paste link, no preview. when we post this sort of link in facebook or wordpress it shows preview there which is good. so please improve the forum editor for facebook, youtube or vimeo link preview.