Facebook sharing

i am creating an ios Application and want to implement facebook and whats app sharing feature.
i just want to open facebook app if it is installed on device and user can share the post on facebook.
so please give me some advice to do so.

You can open Facebook on iOS using a url.

Use the ShowURL declare sample:

Example Projects/iOS/Declares/ShowURL.xojo_binary_project

With something in this list:

[code]fb://profile – Open Facebook app to the user’s profile

fb://friends – Open Facebook app to the friends list

fb://notifications – Open Facebook app to the notifications list (NOTE: there appears to be a bug with this URL. The Notifications page opens. However, it’s not possible to navigate to anywhere else in the Facebook app)

fb://feed – Open Facebook app to the News Feed

fb://events – Open Facebook app to the Events page

fb://requests – Open Facebook app to the Requests list

fb://notes – Open Facebook app to the Notes page

fb://albums – Open Facebook app to Photo Albums list[/code]

Lifted from https://stackoverflow.com/questions/10416338/open-a-facebook-link-by-native-facebook-app-on-ios