If the native Facebook app is installed on the iPhone. How do I open a facebook link into the native Facebook app from my app. In the case of opening by Safari, the link is same as:
Thank you.
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Here are some schemes the Facebook app uses, there are a ton more on the source link:
Example
Schemes
If before opening this url you want to check wether the user fas the facebook app you can do the following (as explained in another answer below):
Source
http://wiki.akosma.com/IPhone_URL_Schemes#Facebook