I exist in a number of communities. You can almost always leave me a message in the Ask Ubuntu General Chat room or the #ubuntu channel on Freenode (username: Oli) but if you want to discuss anything serious, the easiest way is always going to be sending me an email to:
What? did you expecting a complicated webform with an annoying CAPTCHA? Frankly interactive forms attract just as much spam as plain old email addresses, so have at ye!
Send me something nice.