Everything goes to the same team. Pick whichever fits:
Something's broken — Report an issue
Someone's behaviour — User Reporting Form
Appeal a suspension — Suspension Appeal Form
A copy of your data, or deletion — data download request form
An idea for the app — Request a feature
Include your =username where needed so we can find your account, along with screenshots or a screen recording if something's gone wrong or you need to support your claim. We aim to get back to you as quickly as we can.