Facebook and Twitter links in iframe

Thank you for your stunning module! I find that when a user adds a website, the display is perfect .. but does not seem to work with facebook or twitter links (even if I just add http://www.facebook.com) The display stays blank. Is this perhaps a security feature on those sites or am I missing something here? Looking most forward to your reply.

27 Dec 2012 ... Facebook and Twitter links in iframe. Postponed (maintainer needs more info). Project: Link iframe formatter. Version: 7.x-1.1. Component:.

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