How does Tit for Tat work on CC?
Tit for Tat is an equivalent given in return. When someone critiques a story from you, it is common courtesy to critique a story from them in return.
If you go to your username, on top of the page in the right corner, click on Tit for Tat list.
There, you can see the details on how you stand regarding other members you have critted or who have critted you. The system tracks those people who have given you a critique so you can return the favor.