that let you share your score by publishing in someone profile, but don't have any big facebook integration:
with the browser plugin you create a browser go to action an there you call a facebook dialog with your information :
"https://www.facebook.com/dialog/feed?
app_id=XXX
&display=popup&caption= XXX
&link=https%3A%2F%2Fdevelopers.facebook.com%2Fdocs%2Fdialogs%2F
&redirect_uri=https://facebook.com
&name=XXX
&picture=XXXX.png
&description= XXX"
is not the best way to do it, but it works on android, on ios it needs like some permission. and on windows phone it must work.
i hope this work to you