Facebook last month announced Facebook SDK for Android v4.0, with some significant changes: https://developers.facebook.com/docs/android/change-log-4.x
Corona seems to be using v3.x. More precisely, the release notes for build 2014.2458 last October were the latest to mention Facebook, and they say: “Update iOS Facebook SDK to 3.19. Fixes casenum: 35950.”
Facebook now lists v3.x as “deprecated”:
https://developers.facebook.com/docs/android/deprecated
I doubt that Facebook will turn off support for v3.x anytime soon, but it will happen – support for v1.0 was turned off two days ago, I believe, and support for new apps using v1.0 was turned off a year ago. I wanted to flag this to make sure upgrading to v4.x is in the pipeline. Thanks!