bp_xprofile_validate_social_networks_value( $retval,  $field_id, string $value, string $user_id = null )

function bp_xprofile_validate_social_networks_value( $retval, $field_id, $value, $user_id = null ) {

	$field = xprofile_get_field( $field_id, null, false );

	// Allows storing the 'facebook', 'twitter' and so on as array keys in the data.
	if ( 'socialnetworks' !== $field->type ) {
		return $retval;
	}

	if ( $retval ) {
		return $retval;
	}

	$field_name = xprofile_get_field( $field_id )->name;

	if ( 1 === $field->is_required ) {
		foreach ( $value as $key => $val ) {
			$value = trim($val);
			if (empty($value))
				return sprintf( __( '%s is required and not allowed to be empty.', 'buddyboss' ), $field_name );
		}
	}

	$providers = social_network_provider();
	foreach ( $value as $k => $v ) {
		if ( '' === $v || filter_var( $v, FILTER_VALIDATE_URL) ) {

		} else {
			$key = bp_social_network_search_key( $k, $providers);
			return sprintf( __( 'Please enter valid %s profile url.', 'buddyboss' ), $providers[$key]->name );
		}
	}

	return $retval;
}