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How to update all similar DOM elements?

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I am trying to append to two <nav>s. But only second is updated. What am I missing? I tried Array.from(socialMediaIcons).forEach and for loop, but with the same result.

var socialMedia = {
  facebook: 'http://facebook.com/xyz',
  twitter: 'http://twitter.com/xyz',
  flickr: 'http://flickr.com/xyz',
  youtube: 'http://youtube.com/xyz'
};

(() => {
  const socialMediaIcons = document.querySelectorAll(".socialmediaicons");
  const ulElement = document.createElement("ul");

  Object.keys(socialMedia).forEach(key => {
    const liElement = document.createElement("li");
    const imageElement = document.createElement("img");
    imageElement.src = `./images/${key}.png`;
    liElement.appendChild(imageElement);
    ulElement.appendChild(liElement);

  });

  socialMediaIcons.forEach(element => {
    element.appendChild(ulElement)
  });

})(socialMedia)
<!doctype html><html lang="en"><head><meta charset="UTF-8"><title>Social Media Icons</title><link rel="stylesheet" href="style.css"></head><body><nav class="socialmediaicons">Add images below</nav><h1>Welcome</h1><p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Dignissimos, praesentium, reprehenderit, eos, eligendi iure eaque culpa vel distinctio quibusdam amet laudantium aut ea fugit magni quidem iste fugiat sunt voluptate.</p><nav class="socialmediaicons">Add images below</nav><script src="script.js"></script></body></html>

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