I was having troubles figuring out how to share to Facebook. It appears the Facebook app doesn't allow you to prefill the post with the extra string "android.intent.extra.TEXT" , which makes the share intent useless!
However after a bit of googling, i saw this topic: http://www.linkedin.com/groups/Cant-...81.S.111918353
which explains that the Android Facebook app wont let you add plain text to the extra string. You can however share a URL and it will prefill it in the facebook app!
Been trying to figure out this for sometime, now i can finally share to facebook from my game and share a link to the google play listing!