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Hello @Nanax2, have a warm welcome to the Fitbit Community, it's great to have you on board! 
Indeed, you can share on Facebook your daily goals and achievements by following these steps:
- In your Dashboard, tap on the share button
- Then, scroll down and tap on the SHARE button.
- On the following screen tap on Next.
- Then, on the following screen tap on Share Elsewhere
- You will then be able to share your goals or your progress to Facebook.
I hope this can be helpful, give it a try and keep me posted in case you need anything else! 
Best Answer