Logging into DML Planner safeguards your data against accidental browser cache emptying and also gives you the possibility to view your data on different devices.
No worries, DML Planner won't post anything on your Facebook wall, nor spam your email. Having an account here is just to keep your data safe and make it available on all your devices.
If you own a Facebook account, then logging in with Facebook is the quickest way to start using DML Planner.
DML Planner will send you a special link which you can use for logging in, so you wouldn't have to choose and remember yet another password.