Yep! What Sumati said. They're not required, but they are convenient to have and make your stories much more accessible. 

Here's a good example of a TOC

And Sotek's instructions:

The ToC is your Table of Contents page.Itt acts as a central hub fo rall your chapters/short stories/poems.

When you post your TOC or a blog be sure to pick the most relevant Group class for it.

If you’re planning to write a Long Story, you will need to make a Table of Contents (ToC). To make a ToC, create Blog that contains at least the following:
◾A title (no swear words)
◾A brief synopsis of your story
◾Links to each chapter in your story

You will need to regularly update your TOC as you release new chapters; you can do this by adding links.

You just post it as a blog, as you would a story. 

Edit: They are required for long stories

Ahhhh i get it so you dont have to search the individiual chapters and have a blog with the links and a small summary like on the back of a book. ok Thanks i'll make one ^^ 

Adding this here so I don't forget it next week. 

ToC The Hunter and The Prey

I'll try to snag any new posts that haven't been submitted later on. I think it's probably fine to submit for others as far as roundups go since its not a comp like the Features poll. So you can do the same if you like. If you want someone to know you've submitted their work, a quick note on their profile should do just so they're aware and can maybe do the same for one of us down the line.