FAcebook Methods: fb.captcha
You can now secure your application from automated scipting attacks by using fb.captcha.
It
renders a CAPTCHA on your canvas page inside of a form. When that form is submitted to a canvas page, your callback URL will be called with the additional POST parameter fb_sig_captcha_grade=1 to indicate a successfully completed CAPTCHA.
Example:
Just put this code on your canvas page inside of a form:
<form action=index.php method=post>
<fb:captcha showalways=true />
<input type=submit />
</form>
Tags: Apps development, methods
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