1) LDP SMP don't saves plain version of passwords in database(only double hash(very hard guessable value)).
2) LDP SMP saves your text messages, data logged by console, your nickname, username, balances.
3) LDP SMP won't provide private information to not certified entity.
4) Information, provided by user to LDP SMP website, which associated with LDP SMP website account is being stored in LDP SMP website filesystem.