A quick search ( 1 , 2 , 3 ), apparently, indicates that it is impossible to directly "resemble" things as a user using the Graph API for security / spam reasons. One of the recommended alternatives has traditionally been to show the Facebook-controlled โLikeโ button in the WebView and incorporate it into your application.
Recently, however, the Facebook Developer's Guide has provided one possible solution for how you can implement โlikeโ functionality in your application when it comes to posting stories as a user, although this is not exactly the same as you, seems to ask.
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