I have selected to disable rich media on my site (from the admin panel). When users are interacting with the Newsfeed widget I have noticed that the attach icons (picture and video) are still present. When try to upload a picture or embed video code the add button does not allow the upload.
However the problem bug occurs when the user choose to close the dialog box for the rich media and add the comment. Although the dialog box/lightbox has closed it must have stored the details and after the adds the comments the rich media is added to the newsfeed.
The content comment is working as there are no attach icons to interact with.