protected function setup_actions() {
		// Add nonces to activity stream lists.
		add_action( 'bp_after_activity_post_form', array( $this, 'add_activity_stream_nonce' ) );
		add_action( 'bp_activity_entry_comments',  array( $this, 'add_activity_stream_nonce' ) );

		// Add a "mark as spam" button to individual activity items.
		add_action( 'bp_activity_entry_meta',      array( $this, 'add_activity_spam_button' ) );
		add_action( 'bp_activity_comment_options', array( $this, 'add_activity_comment_spam_button' ) );

		// Check activity for spam.
		add_action( 'bp_activity_before_save',     array( $this, 'check_activity' ), 4, 1 );

		// Tidy up member's latest (activity) update.
		add_action( 'bp_activity_posted_update',   array( $this, 'check_member_activity_update' ), 1, 3 );

		// Hooks to extend Activity core spam/ham functions for Akismet.
		add_action( 'bp_activity_mark_as_spam',    array( $this, 'mark_as_spam' ), 10, 2 );
		add_action( 'bp_activity_mark_as_ham',     array( $this, 'mark_as_ham' ),  10, 2 );

		// Hook into the Activity wp-admin screen.
		add_action( 'bp_activity_admin_comment_row_actions', array( $this, 'comment_row_action' ), 10, 2 );
		add_action( 'bp_activity_admin_load',                array( $this, 'add_history_metabox' ) );
	}