Here's the CSS code that goes in the HEAD of your document:
<style type="text/css">
	<!--
	.newstable {
font: 7pt arial, sans-serif;
	}
	//-->
</style>
And here's how it makes the newsfeed look:

Note that you can change the font size by changing the following line in the CSS code:

font: 9pt arial, sans-serif;

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