With the new release of Jetpack 2.0, it has causes my website to have excerpts on every single page. Deactivating Advanced Auto Excerpt WordPress plugin seems to revert the problem. To prevent the plugin from setting each page as excerpt (summary/snippet of the post), below is the correction I did. The last if-statement, just replace the condition with is_front_page()

} else if ($sticky_disable!="yes" && $rss_disable!="yes" && $homepage_disable!="yes") {
			if(is_front_page()) {
			//add_filter('the_excerpt_rss','auto_excerpt');
			add_filter('the_content','auto_excerpt');
		}
	}