protected function setup_properties() {
		$this->id               = sanitize_title( $this->id );
		$this->title            = strip_tags( $this->title );
		$this->link             = esc_url_raw( $this->link );
		$this->description      = strip_tags( $this->description );
		$this->ttl              = (int) $this->ttl;
		$this->update_period    = strip_tags( $this->update_period );
		$this->update_frequency = (int) $this->update_frequency;

		$this->activity_args    = wp_parse_args( $this->activity_args, array(
			'max'              => $this->max,
			'per_page'         => $this->max,
			'display_comments' => 'stream'
		) );

	}