So if you are excited to start sharing but can't figure out how, then follow this step by step tutorial. Just make sure you Update your Facebook App before following this tutorial. Because then only your Mobile App will start showing the newly included Share button.
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Note : People accessing Facebook using mobile browsers don't need to update anything, only the users using Facebook App (Android or iOS) needs to update their respective Apps.
Step 1 : Hit the Share button as it appears under a post on your News Feed, next to the Like and Comment buttons.
Step 2 : Choose who you want to share with. Is this post public? Friends only? Visible only to members of certain groups?
Step 3 : Type a Comment if you wish.
Step 4 : Hit "Post" and you are done!
We hope this helps you out with the Share function on the Mobile version of Facebook and its Mobile App. So enjoy the all new sharing experience from your Mobile and tablets now.