Jetpack sharing: a new button

Hello.
I’m using jetpack sharing block and want to add the new button. The problem is that I have an image gallery and want share every picture separately. Facebook and twitter buttons do it properly (i’ve read how to make it here (http://brimosoft.nl/2011/11/18/jetpack-1-2/), but my new button takes %post_url% and %post_full_url% as the url of the gallery only 🙁 Don’t understand why.

Maybe there are any other tags like %post_url% which can give me proper url? Or maybe I can insert script of my button somewhere in script file to add my button to the block?

Thanks!

http://wordpress.org/extend/plugins/jetpack/