IMDb1M can be seen as complementary to the IMDb62 data set, as IMDb62 allows us to test scenarios in which the user population is made up of prolific users, whereas IMDb1M contains a more varied sample of the population.
because we did not impose a minimum threshold on the number of reviews or posts, the IMDb1M population is very challenging as it includes many users with few texts (e.g., about 56% of the users in IMDb1M wrote only one text).