Google Feed API was retired, thus this project is broken. There are no plans to fix it.

jQuery Feeds

RSS/Atom aggregator with templating and cross-domain support

Demo

Rolling Stones social activity widget built with jQuery Feeds. Facebook, Twitter, Pinterest and Tumblr RSS feeds included.

Check the code

In your markup:

<script type="text/html" id="entryTmpl">
	<article class="<!=source!> entry">
		<p>
			<a class="link" href="<!=feedLink!>" title="<!=feedDescription!>"><!=feedTitle!></a>
			<span class="publishedDate"><!=publishedDate!></span>
		</p>
		<p class="author"><!=author!></p>
		<div class="content"><!=content!></div>
	</article>
</script>

In your script:

$('.feed').feeds({
	feeds : {
		facebook : 'http://www.facebook.com/feeds/page.php?format=atom10&id=8305888286',
		twitter : 'http://search.twitter.com/search.rss?q=from:RollingStones&rpp=100',
		pinterest : 'http://pinterest.com/rollingstones50/feed.rss',
		tumblr : 'http://rollingstonesofficial.tumblr.com/rss'
	},
	preprocess : function(feed) {
		// Using moment.js to diplay dates as time ago
		this.publishedDate = moment(this.publishedDate).fromNow();
	},
	entryTemplate : 'entryTmpl',
	onComplete : function(entries) {
		$(this).find('a').attr('target', '_blank');
	}
});

Check the source code of this page for more information.