Email is the only way to reach us, and it goes to a real inbox.
Bug reports are the most useful thing you can send. If a link came out wrong, paste the URL you put in and the one you got back, and we can usually work out which rule misfired.
Suggestions for parameters we do not handle yet are also welcome. New ones appear regularly and some are only visible to people using a particular platform or region, so we do not always see them on our own.
For anything about how we handle data, the short answer is that we do not: cleaning happens in your browser and nothing you paste is sent anywhere. The privacy policy covers it properly.