Source Reference:

• Component: BuddyPress :: bp-members

  File: /bp-members/bp-members-template.php :: Trac Source Line: 825

  		if ( isset( $bp->displayed_user->userdata->user_email ) )
  			$retval = $bp->displayed_user->userdata->user_email;
  		else
  			$retval = '';
  
  		return apply_filters( 'bp_get_displayed_user_email', esc_attr( $retval ) );
  	}
  
  function bp_last_activity( $user_id = 0 ) {
  	echo apply_filters( 'bp_last_activity', bp_get_last_activity( $user_id ) );
  }
  	function bp_get_last_activity( $user_id = 0 ) {
  		global $bp;
  
  		if ( empty( $user_id ) )
  			$user_id = $bp->displayed_user->id;
  
  		$last_activity = bp_core_get_last_activity( bp_get_user_meta( $user_id, 'last_activity', true ), __('active %s', 'buddypress') );
  
  		return apply_filters( 'bp_get_last_activity', $last_activity );