In vulgar use, Preference Cascade refers to a situation when nigh everyone in a population does something subversive in secret, until a certain event triggers a massive coming out. The key mechanism is individuals not realizing how many likeminded people are around.

In this vein, when Brickmuppet posted about "Moster Musume no Iru Nichijou" (available at Batoto), he thought it was a rather obscure manga. Then, all sorts of people started coming out as readers, even fans. Who knew! The manga's selling point is basically ecchi and nudity of the monster girls (above the waist, naturally).