So if you have facebook you've probably seen that YouTube links play the video on a thumbnail below the post if you copy and paste the link in a post. I want to know if it is possible to make the Scratch flashplayer work the same way. Any ideas?

Do you mean that you want to see a thumbnail preview before you post, or you want to see an embedded video under the link after the post is submitted? I think the latter would be quite doable.

yeah but instead of a post it is the game or project

Sounds like a pretty simple userscript then; let me see what I can whip up with my meager JS knowledge.

thanks

Alright, got something working. Here you go. Install with your userscript extension of choice.

does this work with posting a link in facebook?

*facepalm*

I just… completely misinterpreted what you meant, sorry. If you want a Scratch project embedded in Facebook posts… well, you could certainly do the same thing with another userscript. No one else without the script would see it, though.

hmmm. How can I make the script work for EVERYBODY! Could it be made into an app on https://developers.facebook.com/ ?

No. They require the facebook api iirc.