Content Blocker
We can post anything in chatter and it is created for making collaboration with our co-workers. But, We cant control the content and user can post anything. Merfantz providing excellent plug-in and it will help you to prevent the content. Also, you can activate the rules based user name.
Click the video link to know more : https://www.youtube.com/watch?v=WPfSoH5YHCs