css drop down menu - "hiding" nested menu items - html

Question

I'm trying to create a drop down menu, however I'm having difficulty "hiding" the nested menu items. The links and styling work fine, it's just the drop-down effect that I've missed something on. Ideas?
jsfiddle
css-
#header .social {
float: right;
list-style: none;
padding-top: 20px;
}
#header .social ul li {
display: inline;
position: relative;
}
#header .social ul li ul {
display: none;
}
#header .social ul li a {
display: inline;
padding-left: 6px;
white-space: nowrap;
}
#header .social ul li:hover ul {
display: inline;
position: absolute;
}
#header .social ul li:hover li {
float: none;
}
html/php-
<div class="social">
<ul>
<li><img src="<?php bloginfo('template_url');?>/img/instagram.png" alt="cait and shannon barker instagram" /></li>
<ul>
<li>cait</li>
<li>shannon</li>
</ul>
<li><img src="<?php bloginfo('template_url');?>/img/youtube.png" alt="cait and shannon barker youtube" /></li>
<ul>
<li>cait</li>
<li>shannon</li>
</ul>
<li><img src="<?php bloginfo('template_url');?>/img/facebook.png" alt="cait and shannon barker facebook" /></li>
<ul>
<li>cait</li>
<li>shannon</li>
</ul>
<li><img src="<?php bloginfo('template_url');?>/img/twitter.png" alt="cait and shannon barker twitter" /></li>
<ul>
<li>cait</li>
<li>shannon</li>
</ul>
<li><img src="<?php bloginfo('template_url');?>/img/pinterest.png" alt="cait and shannon barker lockerz" /></li>
<ul>
<li>cait</li>
<li>shannon</li>
</ul>
</ul>
</div><!-- end social -->

Answer 1

Is this what you are looking for ? http://jsfiddle.net/cScrD/3/
The HTML structure was not standard (ul should not be ideally put as a child of another ul. Rather open an li tag and put the ul inside the li). The structure should ideally be like this.
<div id="header">
<div class="social">
<ul>
<li><img src="<?php bloginfo('template_url');?>/img/instagram.png" alt="cait and shannon barker instagram" /><!-- li should not end here -->
<ul>
<li>cait</li>
<li>shannon</li>
</ul>
</li><!-- li should end here -->
</ul>
</div>
</div>