JSFiddle - React, Tailwind, and code Playground

HTML

<div id="pageHeader">
    <div class="social">
        <ul>
            <li><a href="http://www.facebook.com/blackstonefilms" rel="external"><img src="%pathto(images/facebook-social-icon.png)%" alt="Link to Facebook" /></a>

                <ul>
                    <li>
                        <p>like on facebook</p>
                    </li>
                </ul>
            </li>
            <li><a href="http://www.youtube.com/user/theblackstonefilms" rel="external"><img src="%pathto(images/youtube-social-icon.png)%" alt="Link to Youtube" /></a>

                <ul>
                    <li>
                        <p>subscribe on youtube</p>
                    </li>
                </ul>
            </li>
            <li><a href="http://vimeo.com/blackstonefilms" rel="external"><img src="%pathto(images/vimeo-social-icon.png)%" alt="Link to Vimeo" /></a>

                <ul>
                    <li>
                        <p>subscribe on vimeo</p>
                    </li>
                </ul>
            </li>
            <li><a href="#" onClick="window.open('/opt-in.html','_blank','toolbar=0, location=0, directories=0, status=0, scrollbars=0, resizable=0, copyhistory=0, menuBar=0, width=200, height=340,');return(false)"><img src="%pathto(images/email-social-icon.png)%" alt="Signup for our E-List!" /></a>

                <ul>
                    <li>
                        <p>join the e-list</p>
                    </li>
                </ul>
            </li>
        </ul>
    </div>
</div>

CSS

#pageHeader .social {
	position:absolute;
	top: 7px;
	right: 0;
	height: 27px;
	margin: 0;
	padding: 0;
}

#pageHeader .social img {
	margin: 0;
	padding: 0;
	opacity: 0.7;
	-moz-transition: opacity ease .3s; /* Firefox 4 */
	-webkit-transition:opacity ease .3s; /* Safari and Chrome */
	-o-transition:opacity ease .3s; /* Opera */
}

#pageHeader .social img:hover {
	opacity: 1.0;
}

#pageHeader .social ul {
	list-style:none;
	margin: 0;
	padding: 0;
}

#pageHeader .social ul li {
	display: inline-block;
	height: 27px;
	margin: 0;
	padding: 0;
}

#pageHeader .social ul ul {
	position: absolute;
	top: 30px;
	width:160px;
	text-align: right;
	opacity: 0.0;
	-moz-transition:opacity ease .6s, right step-end 1.2s; /* Firefox 4 */
	-webkit-transition:opacity ease .6s, right step-end .6s; /* Safari and Chrome */
	-o-transition:opacity ease .6s, right step-end .6s; /* Opera */
    transition:opacity .6s ease, right step-end .6s;
	-webkit-backface-visibility: hidden;
	-moz-backface-visibility:    hidden;
	-ms-backface-visibility:     hidden;
    right: 9999px;
}

#pageHeader .social ul li:hover ul {
	opacity: 1.0;
	-moz-transition:opacity ease .6s; /* Firefox 4 */
	-webkit-transition:opacity ease .6s; /* Safari and Chrome */
	-o-transition:opacity ease .6s; /* Opera */
    transition:opacity .6s ease;
    right: 0;
}

#pageHeader .social ul li ul li p {
	font: 16px/21px futura-pt, Helvetica, sans-serif;
}