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Hide sponsored posts on LinkedIn / Facebook / Twitter / X — CSS + MutationObserver

15 May 2026 · by JustZix Team

Social media feeds are ~30% sponsored posts mixed into organic. Sponsored posts are designed not to look like ads — random class hashes, dynamic DOM. Standard ad-blockers catch them by URL pattern (DoubleClick, Adsense), not by feed layout. That's where JustZix combining CSS + JS shines.

LinkedIn (linkedin.com)

LinkedIn has the most obfuscated DOM. Class names like .feed-shared-update-v2--ad are stable but change on every redesign. Text matching is reliable:

/* CSS attempt — catches some */
[data-ad-banner], .feed-shared-update-v2--promoted,
.feed-shared-actor__sub-description:has-text("Promoted") {
  display: none !important;
}

CSS :has-text() is NOT standard — that's a JustZix-only pseudo. Fallback via JS MutationObserver:

// JS rule — text-match "Promoted" in feed cards
const hideSponsored = () => {
  document.querySelectorAll('.feed-shared-update-v2, [data-id*="urn:li:activity"]').forEach(card => {
    if (card.dataset.jzChecked) return;
    card.dataset.jzChecked = '1';
    const text = card.textContent;
    if (/^Promoted|Sponsored/m.test(text) ||
        /\bPromoted\b/.test(card.querySelector('.feed-shared-actor__sub-description')?.textContent || '')) {
      card.style.display = 'none';
      JUSTZIX.log(`[LinkedIn] Hidden sponsored card`);
    }
  });
};
new MutationObserver(hideSponsored).observe(document.body, {childList: true, subtree: true});
hideSponsored();

Facebook (facebook.com)

FB has ARIA-based markers — more stable than class names:

/* Posts with "Sponsored" label — Facebook uses aria attributes */
div[aria-label="Sponsored"],
div:has(> * > span[aria-label="Sponsored"]),
[data-pagelet*="Sponsored"] {
  display: none !important;
}
/* Side rail with "Suggested for you" */
[aria-label="Suggested for you"], [aria-label="Reels and short videos"] {
  display: none !important;
}

JS booster — cleans the feed on scroll, since infinite-scroll loads new posts:

// JS rule
new MutationObserver(() => {
  document.querySelectorAll('div[role="feed"] > div').forEach(post => {
    if (post.dataset.jzChecked) return;
    post.dataset.jzChecked = '1';
    if (post.querySelector('[aria-label="Sponsored"]')) {
      post.style.display = 'none';
      JUSTZIX.log('[FB] Hidden sponsored');
    }
  });
}).observe(document.body, {childList: true, subtree: true});

Twitter / X (twitter.com / x.com)

X has a "Promoted" label as SVG icon + text. Twitter also has "Suggestions" / "Trends for you" sidebars:

/* Sponsored tweets */
article:has([data-testid="promotedIndicator"]),
article:has(svg[data-testid="ad"]) {
  display: none !important;
}
/* Trends + Who to follow sidebar */
[aria-label="Timeline: Trending now"],
[data-testid="sidebarColumn"] [data-testid="UserCell"] {
  display: none !important;
}

Use case 1 — TOGGLE3 "Ad protection level"

Per-platform 3-stage strictness:

// Action TOGGLE3 "🛡️ Protection"
states[0] = { label: 'Off',    value: 'off' }    // no filtering
states[1] = { label: 'Normal', value: 'normal' } // hide sponsored
states[2] = { label: 'Strict', value: 'strict' } // hide sponsored + suggested + trends

code: |
  document.documentElement.dataset.jzProtection = value;
  JUSTZIX.log(`Protection: ${value}`);

CSS rule uses the data attribute:

html[data-jz-protection="off"] .jz-hide-sponsored { display: block !important; }
html[data-jz-protection="strict"] [aria-label*="Suggested"] { display: none !important; }

Use case 2 — Output Console counts hidden elements

// In a JS rule:
let hiddenCount = 0;
window.JZ_HIDDEN_SPONSORED = () => {
  JUSTZIX.log(`[${location.hostname}] Hidden sponsored count: ${hiddenCount}`);
};
// Increment in each .style.display = 'none': hiddenCount++;
// Call from JS Console: JZ_HIDDEN_SPONSORED()

Pitfalls

• Selectors change. Social media platforms often reorganise the DOM to make blocking harder. Test rules monthly.
• Text-matching is fragile for i18n. "Promoted" / "Sponsored" / "Reklama" / "Promocja" — different languages. Add a regex disjunction.
• MutationObserver is expensive on large feeds. Throttle the observer (setTimeout 200ms debounce) if FPS drops.
• :has-text() is not CSS standard. JustZix supports it. In native CSS use :has(div:contains(...)) (also non-standard) or a JS observer.

What's next

• Hide cookie banners — sister pattern
• Customize AI chat apps — CSS + JS observer pattern
• TOGGLE3 — 3-state protection switcher

Install JustZix and reclaim 30% of your feed for organic content.