Among them are the increasingly popular reality shows and all the daily news about gossip and scandal.

increasingly 是形容词 increasing 的副词形式，由动词 increase（增加）加上 -ing 构成形容词，再加上 -ly 构成副词，表示"越来越..."，用来修饰形容词 popular，表示"越来越受欢迎"。