footer.php

<?php

?>
<footer>
    <div class="row">
        <div class="col-sm">
            <h1>Acerca de nosotros</h1>
            <ul>
                <li><a href="news.php">Últimas noticias</a></li>
                <li><a href="help.html">Centro de ayuda</a></li>
                <li><a href="whoweare.html">¿Quienes somos?</a></li>
                <li><a href="looking.html">Te estamos buscando</a></li>
                <li><a href="prices.html">Planes y precios</a></li>
            </ul>
        </div>
        <div class="col-sm">
            <h1>Contacto</h1>
            <ul>
                <li><a href="contact.html">¿Donde están los servidores?</a></li>
            </ul>
        </div>
        <div class="col-sm">
            <h1>Redes Sociales</h1>
            <div class="twitter"></div>
            <div class="facebook"></div>
            <div class="youtube"></div>
        </div>
    </div>
</footer>
</div>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
</body>
</html>