There are a few easy ways to safely and privately contact me with sensitive information. Please pick whichever is easiest for you.
You can send me an encrypted email (firstname.lastname@example.org) using PGP. My public key can be found right here.
If you want to send me an anonymous email but you don’t want to set up PGP, I recommend using a Guerrilla Mail disposable email account. But remember, I probably won’t be able to reply to you with this if your account self-destructs.
I also use Confide, another secure, self-destructing IM app.
Twitter DMs are not secure, but if you’d like to set up an encrypted conversation, my Twitter DM inbox is open to everyone—I’m at @samfbiddle.