The timeago.js keeps flickering when the setTimeout function of reloading the page is called...

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I have a small social website, and it has a "wall" where all user posts are shown. The "wall" has this function in it

<script>$(function load_posts(){  $("#all_posts").load("/all_posts.php")
setTimeout(load_posts, 500);})</script>
<div id="all_posts"></div>

Where "all_posts.php" shows all of the posts. However each posts has a date and the timeago.js with it so it displays "posts 2 hours ago" etc.
But when the function is called and the all_posts.php is reloaded the time flashes for a second then disappears...does anyone know why this is and how i could fix it?