The NGFB plugin generates information about the current webpage and its content - what social websites like Facebook do with that information is beyond our control. When Facebook is given information on videos, it embeds and plays them directly instead of linking the preview image (as an example) to the source website. There are two possible solutions:

  1. Turn off video discovery completely by setting "Maximum Number of Videos" to "0" in the NGFB settings page.
  2. Uncheck the og:video, og:video:width, og:video:height, and og:video:type meta tags. This will leave the video preview images, but exclude information on the videos themselves.