I'm developing a forum/community site and I was thinking how much embedding options should I give to the users. Until now, it is possible upload images and the URLs in the posts are parsed and converted into links.
Now, what if aside from parsing the URLs, depending on if a URL is a link to YouTube video or Dailymotion video, etc. the YouTube video object or the Dailymotion video object respectively was embedded in the post?
I was thinking that I could do a whitelist with many possible safe-sites (which allow embedding) that could be embedded from like Ustream, Justin.tv, Metacafe, YouTube, Dailymotion, Vimeo, etc.
As in most forums I've seen this isn't possible to do, I wonder, is there any downside to this? Would it be better to just allow image posting?