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Pass a score through Fb_dialog url?


So, the new Facebook extension has stopped letting you add custom text to the description when letting users post to their wall, now you can only provide a link to a site. So can anyone think of a way to pass a score through a url address?

For example:
fb_dialog("www.mywebsite.com/game_facebook_post+<the score from my game>")

In theory the score I pass through the url would change the description fb meta tag on my webpage so when it comes to get shared the score shows up on the post

Could anyone with any html knowledge tell me if this is even possible?
Or does anyone have any other ways this could be achieved?

I hope I've explained myself properly :p