Question

Here is the example:
http://developers.facebook.com/docs/reference/dialogs/feed/

It’s supposed to do a popup with the message “Facebook Dialogs are so easy!” But when I go to the url, the textarea is empty. Thus proving itself wrong.

How do you make a dialog box when the message entered already, so the user can just click share without typing anything?

Try it yourself:
http://www.facebook.com/dialog/feed?app_id=123050457758183&link=http://developers.facebook.com/docs/reference/dialogs/&picture=http://fbrell.com/f8.jpg&name=Facebook%20Dialogs&caption=Reference%20Documentation&description=Dialogs%20provide%20a%20simple,%20consistent%20interface%20for%20applications%20to%20interact%20with%20users.&message=Facebook%20Dialogs%20are%20so%20easy!&redirect_uri=http://www.example.com/response

Answer 1

Facebook recently removed this functionality, so it is no longer possible. The message parameter is now ignored. You can thank spammers for that.

http://developers.facebook.com/blog/post/510/

Sorry.

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There is also a note about this in the Feed Dialog API docs:

message
This field will be ignored on July 12, 2011 The message to prefill the text field that the user will type in. To be compliant with Facebook Platform Policies, your application may only set this field if the user manually generated the content earlier in the workflow. Most applications should not set this.