TitForTat is definitely related to IteratedPrisonersDilemma by way of the work of RobertAxelrod? http://www-personal.umich.edu/~axe/ discussed in Axelrod's work Evolution of Cooperation http://cooperationcommons.com/node/398
That being said, I agree with Helmut that TitForTat should have it's own page, as IteratedPrisonersDilemma is not 1 to 1 equal to TitForTat, but rather, is a *strategy for "winning" IPD* according to Axelrod