Given your LI markup:
<li>
<a href="#">
<img src="http://pbs.twimg.com/profile_images/1225696765/29072010042_normal.jpg" />
<h3 class="wrap">Marco Alberto Sotelo (@marcosotelo79)</h3>
<p>Sun Feb 02 20:01:24 +0000 2014</p>
<p class="wrap">Ya estamis en el estadio MetLife para el @SuperBowl #SBUniversal http://t.co/80 /1wSo5O9E</p>
<br />
<img src="http://pbs.twimg.com/media/Bffo-1MCIAEoY5X.jpg" style="max-width: 90%; margin: auto;" />
</a>
</li>
Change the class wrap to:
.wrap {
white-space: normal !important;
}
The !important allows the class to override all the jQM classes that are setting it to nowrap.
Here is a DEMO