At character creation, each player writes a number of rumors about their characters equal to (numberOfCharacters - 1) * 2. The goal here is to encourage players to really talk to each other in character.
That means, in a group of 4 characters, (4 - 1) * 2 = 6. At least one of the rumors should be true and at least one should be false. The remaining (in this example, ((4 - 1) * 2) - 2 = 4) can be either true, false, or kinda true.
At the start of the session, we shuffle and distribute the rumors from one player to the others, repeating the process until all players receive two rumors from each other player. No player should keep rumors about their own character.