We don't have a way for your to separate your Plotbot/Facebook accounts through our system yet, but I'll try to add that soon. You can disconnect your account through Facebook.

When you sign into Plotbot, you have a choice of using Facebook or our credentials. If you choose Facebook, you'll need to tell Facebook it is ok to connect your account (that's the popup window you'll see). After that, we'll take you to a page where you tell us whether you want to create a new account or connect your current account.

You must have skipped that page somehow; how did you connect your account to Facebook? Through a link on Facebook or our site?