Im using this method:
https://www.facebook.com/sharer.php?u=<url to share>&t=<title of content>
Is there any way without an app to show up the dialog with a default message inside the textarea?
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I am going to go with no. There is no documentation mentioning anything about it.
Also the sharer.php method has been depreciated for some time. I suggest you use the facebook like button or a dialog – https://developers.facebook.com/docs/reference/dialogs/
While sharer.php works, Facebook no longer support it. Meaning if it breaks, they won’t fix it.