Each user could have an unlimited amount of 'tags', which they could attach to another user. These 'tags' would not be seen by anyone accept the user who had put them there.

There would be different types of tags, such as 'Undesirable Player/Narrator' and 'Desirable Player/Narrator', thus allowing Storium users to keep track of who they like to play with, and who they don't. This could help to prevent future conflicts.