The newsfeed is generating public links off of full name instead of username (BB-2837)
The newsfeed has avatar images and links for each user. It looks like if a user has a full real name entered, the link generated is based off of that, and the link therefore 404s.
Example: The avatar image for me is in a <a href="/Marshall%20Pierce">. This 404s. /marshallpierce, however, works fine. For users that don't have a full name entered, the link uses their username (not their full name) and it works fine.