bp_message_get_recipient_tabs()

function bp_message_get_recipient_tabs() {
	$recipients = explode( ' ', bp_get_message_get_recipient_usernames() );

	foreach ( $recipients as $recipient ) {

		$user_id = bp_is_username_compatibility_mode()
			? bp_core_get_userid( $recipient )
			: bp_core_get_userid_from_nicename( $recipient );

		if ( ! empty( $user_id ) ) : ?>

			<li id="un-<?php echo esc_attr( $recipient ); ?>" class="friend-tab">
				<span><?php
					echo bp_core_fetch_avatar( array( 'item_id' => $user_id, 'type' => 'thumb', 'width' => 15, 'height' => 15 ) );
					echo bp_core_get_userlink( $user_id );
				?></span>
			</li>

		<?php endif;
	}
}