Facebook share link - can you customize the message body text?
Simplest way to share on facebook is:
https://www.facebook.com/sharer/sharer.php?u=xerosanyam.github.io"e=You_are_amazing
Bonus:
Simplest way to share on twitter is:
https://twitter.com/intent/tweet?via=xerosanyam&text=You_are_amazing
NOTE: @azure_ardee solution is no longer feasible. Facebook will not allow developers pre-fill messages. Developers may customize the story by providing OG meta tags, but it's up to the user to fill the message.
This is only possible if you are posting on the user's behalf, which requires the user authorizing your application with the publish_actions permission. AND even then:
please note that Facebook recommends using a user-initiated sharing modal.
Have a look at this answer.
You can't do this using sharer.php, but you can do something similar using the Dialog API. http://developers.facebook.com/docs/reference/dialogs/
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
The catch is you must create a dummy Facebook application just to have an app_id. Note that your Facebook application doesn't have to do ANYTHING at all. Just be sure that it is properly configured, and you should be all set.
November 2021 update
The feed part of the Dialog API no longer includes the message field in the message. It is not included in the feed dialog documentation. The fields picture, name, caption, and description are now deprecated.
Therefore, for the purpose of sharing to the wall, you're better off with sharer.php, which does not require an app_id, and therefore does not need registering an app:
http://www.facebook.com/sharer.php?u=https://example.com