User blog comment:Jurassic Park Treasury/Warning/@comment-1259419-20140103090031

This could work.

However, we should pick to much on the new users. For many, adding a category is their first edit. Performed before they are shown the Common Mistakes section. If we act too angry on them after their 1st edit, they won't stay here.

I think we should send everyone a second "welcome message" warning them not to add speculation or categories.