Remove useless comments from Facebook automatically using Tampermonkey.

fuckyouuselesscomments.js

// ==UserScript==
// @name         Fuck you useless comments!
// @namespace    http://tampermonkey.net/
// @version      0.0.1
// @description  Remove useless comments from Facebook.
// @author       Renan Coelho <sayhicoelho@gmail.com>
// @match        https://www.facebook.com/*
// @grant        none
// ==/UserScript==

(function() {
  'use strict';

  const interval = 3000

  const matches = [
    'o naruto é duro as vezes',
    'comentário teste',
    'nunca ganhou uma guerra mas nunca perdeu',
    'quando winston churchill soube do ataque a pearl harbor',
    'o naruto pode ser meio duro as vezes',
    'mano troca só a vga e seja feliz o resto ta safe',
  ]

  function normalize(str) {
    return str.normalize("NFD").replace(/[\u0300-\u036f]/g, "")
  }

  function isUselessComment(str) {
    for (let m of matches) {
      if (normalize(str).toLowerCase().includes(normalize(m).toLowerCase())) {
        return true
      }
    }
  }

  function searchComments() {
    const comments = document.querySelectorAll('._7791 li')

    for (let c of comments) {
      const textElement = c.querySelector('._3l3x')

      if (textElement && isUselessComment(textElement.textContent)) {
        c.remove()
      }
    }
  }

  setInterval(searchComments, interval)
})();