We're adding Google Play game services achievements to our game (Epic Swords). We're in final testing, it works *except* I had expected that unlocked achievements would be visible or posted in some manner through g+. I do not see this sharing occurring.

Google's docs imply these are shared, e.g. "Sign in with Google to share your scores and achievements with friends" <http://goo.gl/V3Y41> and various other places, although it is vague on how these are shared.

Q1: Are unlocked play services achievements automatically visible through g+?

Q2: If yes, then are we doing something wrong in how we are testing these?

Q3: If no... well, why implement achievements using play services instead of rolling our own? It would be simpler and more reliable to do our own implementation (there's a lot of complexity due to synchronizing state with google's cloud, not to mention some interesting bugs in their client code ;-)

Background: We have published the Google Play game services. Everything works fine in-game, and the state is being shared/retrieved from google. I selected Public visibility for game progress when signing in to game services.

btw we could add explicit g+ sharing when achievements unlock using the general sharing API <http://goo.gl/L70sY> but again... if we have to do that then why use the play services achievements at all?