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Hi there @Raptorgaetano, let me start by giving you a warm welcome to our Fitbit Community. On your Android app you can share your main stats from your Dashboard, like steps, calories, floors, etc. Also you can share exercise, badges and adventures achievements along with challenges accomplishments.
For this you just need to have your Facebook account connected with your Fitbit account. This can be found on your Friends tab > 7 days steps > Add friends with the lower pink circle > move to the Facebook tile and connect your accounts.
Usually when you can share achievements on Facebook, you should be able to see the following icon for Android:
When you are sharing exercise the option will allow you to share also a picture. For more details take a look at this post shared by @SantiR.
Hope this helps. Let me know if you have additional questions.
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