Why Facebook prompt_feed.php is causing browser window to resize itself

We use Facebook's prompt_feed.php in order to do sharing from a widget.

When we popup a browser window with the sharing URL that uses prompt_feed.php it causes Safari (and in some cases also Firefox) to resize themselves to strange dimensions.

Anyone encountered that? anyone knows 开发者_如何转开发how to avoid this?

Thanks Guy

Please use the Feed Dialog in order to allow a user to share content to Facebook from your site. https://developers.facebook.com/docs/reference/dialogs/feed/

prompt_feed.php is unsupported.