I bit the bullet and linked my SK account with Steam so I can use the trade, but I play on other computers sometimes, and having to install Steam on all of them would be extremely annoying.
I read some time ago some time ago that if you log onto the forums and click the 'Facebook' button (without actually linking your account to FB) on a stand-alone SK, you can log in through the SK forums and bypass Steam. However, this doesn't work for me. When I click the button, a tab saying "You are now logged in, please return to Spiral Knights." opens in my browser and SK says "Connecting to Facebook in your Web Browser. Please wait..." Nothing happens after that, though.
Does Facebook log in work for you guys?
My main account is FB. Logged in today.
I dunno where you got that trick from......