A lot of people sign their names when they make edits. This means that for the same reason why categories work, you can click the title of their homepage to get a list of the edits they've signed and subpages of their homepage.
If you're new to ToothyWiki, then welcome. If you want to create a homepage, just sign your name after two dashes without a space, like this: --AC Then click that link to go to your homepage and tell us about yourself.
To newbies whose homepages just got linked here: welcome; you might want to visit RecentChanges to see what people are talking about and whether anyone's responded to stuff you posted yet. Other useful places to read are WhatIsWiki and WikiEtiquette.