facebook like box

Im trying to fit a standard facebook like box. It works in preview mode but returns a fault in live mode.

Standard code:

<iframe src=”//www.facebook.com/plugins/likebox.php?href=https%3A%2F%2Fwww.facebook.com%2FFacebookDevelopers&width&height=258&colorscheme=dark&show_faces=true&header=false&stream=false&show_border=false&appId=176908142349681″ scrolling=”no” frameborder=”0″ style=”border:none; overflow:hidden; height:258px;” allowTransparency=”true”></iframe>

https://developers.facebook.com/docs/plugins/like-box-for-pages

Result >>

the page returns this fault where the facebook like box should have been:
The href parameter must reference a valid Facebook page, but “httpswww.facebook.comFacebookDevelopers” is not a valid Facebook page.

Its as if the plugins removes all the dots ?

https://www.ads-software.com/plugins/cbach-wp-gridster/