Various suggestions:

• RSS Feed leads to Fatal error (Fatal error: Access to undeclared static property: IPS\Content\Search\Result\Content::$databaseColumnId in /var/app/current/applications/core/modules/front/discover/streams.php on line 224)
• "Showing topics I have not read" is clickable.  But doesn't do anything.  
• Avatar and FA icon are disjointed and look very awkward.  
• Avatar exceeds content box
• Content item's title is on new line, which leaves excessive space next to Avatar and FA icon
•  Username is not clickable

7 minutes ago, Joel R said:

Avatar and FA icon are disjointed and look very awkward.  

Agreed. I submitted a feedback about it.