Find non-followers on X

find-non-followers.js

// Highlights accounts you follow that don't follow you back on X
// Run in browser console while on your Following list

const CELL_SELECTOR = 'div[data-testid="cellInnerDiv"]';
const FOLLOWS_TEXT = 'Follows you';
const nonFollowers = new Set();
let lastScrollHeight = 0;
let stableCount = 0;

function extractUsername(cell) {
  const link = cell.querySelector('a[href^="/"]');
  return link?.pathname.slice(1) || null;
}

function updateCell(cell) {
  const text = cell.innerText;
  const username = extractUsername(cell);
  
  if (!username) return;
  
  if (!text.includes(FOLLOWS_TEXT)) {
    nonFollowers.add(username);
  }
  
  if (nonFollowers.has(username)) {
    cell.style.border = '2px solid red';
  } else {
    cell.style.border = '';
  }
}

async function scrollToEnd() {
  return new Promise(resolve => {
    const interval = setInterval(() => {
      const scrollHeight = document.body.scrollHeight;
      const viewportHeight = window.innerHeight;
      const currentPosition = window.scrollY;
      const atBottom = currentPosition + viewportHeight >= scrollHeight - 10;
      
      if (atBottom) {
        if (scrollHeight === lastScrollHeight) {
          stableCount++;
          if (stableCount >= 3) {
            clearInterval(interval);
            window.scrollTo(0, 0);
            console.log(`✓ Found ${nonFollowers.size} non-followers`);
            console.log('Export: copy(Array.from(nonFollowers).sort())');
            resolve();
          }
        } else {
          stableCount = 0;
          lastScrollHeight = scrollHeight;
          window.scrollBy(0, viewportHeight);
        }
      } else {
        window.scrollBy(0, viewportHeight);
      }
    }, 200);
  });
}

new MutationObserver(mutations => {
  mutations.forEach(m => {
    if (m.type === 'childList') {
      m.addedNodes.forEach(node => {
        if (node.nodeType !== 1) return;
        
        if (node.matches?.(CELL_SELECTOR)) {
          updateCell(node);
        } else {
          node.querySelectorAll?.(CELL_SELECTOR).forEach(updateCell);
        }
      });
    } else {
      const cell = m.target.closest?.(CELL_SELECTOR);
      if (cell) updateCell(cell);
    }
  });
}).observe(document.body, {
  childList: true,
  subtree: true,
  characterData: true,
  attributes: true
});

scrollToEnd();