Steempeak.com allows you to select the option of using an author's mute list, which means you would not see comments in the author's feed of those who have been muted. Well, you would see the comment 'disabled' with the option to click a link before viewing it.

Otherwise, if you do not use SteemPeak or don't have that option enabled, muting is a personal preference; if you mute someone you would not see their posts or comments in your own feed.  

How it relates to the tribe is that those people who are muted will not receive rewards because the #creativecoin curators will have them muted.