public function __construct( $args = array() ) {

		/**
		 * Filters if BuddyPress should consider feeds enabled. If disabled, it will return early.
		 *
		 * @since 1.8.0
		 *
		 * @param bool true Default true aka feeds are enabled.
		 */
		if ( false === (bool) apply_filters( 'bp_activity_enable_feeds', true ) ) {
			global $wp_query;

			// Set feed flag to false.
			$wp_query->is_feed = false;

			return false;
		}

		// Setup data.
		$this->data = wp_parse_args( $args, array(
			// Internal identifier for the RSS feed - should be alphanumeric only.
			'id'               => '',

			// RSS title - should be plain-text.
			'title'            => '',

			// Relevant link for the RSS feed.
			'link'             => '',

			// RSS description - should be plain-text.
			'description'      => '',

			// Time-to-live - number of minutes to cache the data before an aggregator
			// requests it again.  This is only acknowledged if the RSS client supports it
			//
			// See: http://www.rssboard.org/rss-profile#element-channel-ttl.
			// See: http://www.kbcafe.com/rss/rssfeedstate.html#ttl.
			'ttl'              => '30',

			// Syndication module - similar to ttl, but not really supported by RSS
			// clients
			//
			// See: http://web.resource.org/rss/1.0/modules/syndication/#description.
			// See: http://www.kbcafe.com/rss/rssfeedstate.html#syndicationmodule.
			'update_period'    => 'hourly',
			'update_frequency' => 2,

			// Number of items to display.
			'max'              => 50,

			// Activity arguments passed to bp_has_activities().
			'activity_args'    => array()
		) );

		/**
		 * Fires before the feed is setup so plugins can modify.
		 *
		 * @since 1.8.0
		 *
		 * @param BP_Activity_Feed $this Current instance of activity feed. Passed by reference.
		 */
		do_action_ref_array( 'bp_activity_feed_prefetch', array( &$this ) );

		// Setup class properties.
		$this->setup_properties();

		// Check if id is valid.
		if ( empty( $this->id ) ) {
			_doing_it_wrong( 'BP_Activity_Feed', __( "RSS feed 'id' must be defined", 'buddypress' ), 'BP 1.8' );
			return false;
		}

		/**
		 * Fires after the feed is setup so plugins can modify.
		 *
		 * @since 1.8.0
		 *
		 * @param BP_Activity_Feed $this Current instance of activity feed. Passed by reference.
		 */
		do_action_ref_array( 'bp_activity_feed_postfetch', array( &$this ) );

		// Setup feed hooks.
		$this->setup_hooks();

		// Output the feed.
		$this->output();

		// Kill the rest of the output.
		die();
	}